DF Maisey Gunsmithing Services


Gunsmith Services
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Custom Hunting, Target and Tactical Rifles
Muzzle Brakes
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Gunsmith Services

Established in 1997 by Dean Maisey, after returning from training as a gunsmith with CST, in Lakewood, Colorado, USA. Previous to this he had a background and qualifications in electrical, refrigeration, and mechanical engineering/design. The purpose of his travel to the USA was to gain firearm -specific training, with an associated, recognised qualification. The intention of establishing this business in Tauranga was to fill a void in the market, and to provide a prompt, professional service with a high standard of workmanship and ethics. Over eighteen years later, with a successful business and general acceptance as being among the leaders of the gunsmithing industry in New Zealand, it can be sincerely stated that this goal has been achieved. References can be provided if required.

Gunsmith Dean working

General Repairs

All firearms accepted for work undergo a 40-point 'pre-check' for function and condition before any requested work commences.  This is absolutely necessary in case there are other faults present with the firearm that the owner is not aware of, or may have forgotten to mention.  Any accessories or hardware supplied with the firearm or missing is also noted.  Other 'special checks' such as headspace, sear engagement, feeding, extraction and ejection, etc, are all included on the job sheet.   Some gunsmiths charge extra for these sorts of checks, we don't.

A thorough inspection can shed light on the causes of any present or potential faults.  Final checks after requested work has been completed often include test firing with live ammunition and cleaning to ensure that the firearm is in full working order before it leaves our workshop.   All our repair work is covered by warranty and quality workmanship assured.

Rebluing, Parkerizing, Mil-spec Coatings

The main types of bluing we undertake in our workshop are the hot caustic bluing method, traditional rust bluing method and the Nitre Bluing (or Fire Bluing) for small parts. We can also do colour casing of some parts.

Overview of Bluing Operation
All metalwork to be blued must be first brought up to an acceptable finished state.  This would include removal of any rust spots and pitting, rough machining, and any other surface imperfections using the most professional and efficient methods possible.  The quality of workmanship by the 'metal' polisher must be of the highest standard to avoid common mistakes by the amateur, such as 'running' the engraving or the edges of flat surfaces.

The hot dip bluing process (briefly) involves degreasing of the parts before immersion in a hot (280 F) caustic solution until the right depth of colour is obtained. The process does not alter the surface finish.  The parts are then rinsed cold, then boiled out in hot water mix to remove any traces of the caustic 'salts' that may have worked into small recesses in the parts. The parts are then submersed in special finishing oil and allowed to cool, before draining off and allowing to 'stand' overnight.  The bluing process is usually complete within a few hours.

The traditional Rust bluing method is a lot slower and very labour intensive.  Briefly, the process involves degreasing the parts, boiling out in hot water to heat the parts and remove any foreign residues.  Chemical solution is then carefully swabbed onto the parts and they are then suspended in a special 'rusting chamber' where the temperature and humidity is controlled for about 2 hours.  This allows a red rusting to form on the parts and also slightly etches the surface of the steel.  Using a stronger solution, or increasing the temperature, humidity level or time spent in the rusting chamber can increase the degree of etching.   Skill and practice must be used to achieve the right degree of etching.  Too much can spoil the job.  The parts are then boiled in hot water for 10-15 min. This changes the red rusting to black.
BluingThe parts are dried off, then the loose rust is 'carded off' with either a very fine wire wheel or '0000' grade steel wool.  Care must be taken at all times not to touch the parts by hand to avoid contamination with oil.  The chemical solution is then swabbed onto the parts again and the cycle is repeated 4 or more times until the right depth of colour with an even finish is achieved.
Finally the parts are boiled out to neutralise the rusting, then they can be soaked in the finishing oil.  The process can run over several days.  It is usually more durable than caustic bluing.

Nitre Bluing (Fire bluing) is usually for smaller parts such as screw and pinheads, sight parts, triggers, etc.
Dry potassium Nitrate (Nitre) is carefully heated until it melts.  The degreased parts are then quickly suspended into the molten chemical and watched carefully until the right colour change is reached.
The desired colours are often straw, purple, or iridescent blue.
The process takes only a few minutes or less depending on the size of the part.  It is then quickly removed and either allowed to cool at room temperature or quenched in boiling water.  If the part is air-cooled it must be dipped in boiling water to remove the dried chemical.  The part can then be examined for any imperfections, then lightly oiled.  The oxide (bluing) layer is very thin.

The Parkerizing process is different from the bluing process (which is essentially a pre-rusting/ oxidising of the steel surface) in that Parkerizing is actually a manganese- phosphate coating that chemically bonds to the surface of the steel.  The colour obtained is grey to dark grey/black depending largely on the hardness of the steel.  Generally the softer the steel the darker the finished colour.  For this reason you often get a different colour shade between the barrel and receiver or other 'hardened parts'.  Parkerizing bonds best onto a bead blasted surface, the finish is a matt non-glare coating, that is microscopically porous.  This helps to hold rust preventing oils on the surface.  Parkerizing has long been used as a military coating, and while not being as attractive to some as bluing, it is an excellent choice for hunting guns being far more durable than all of the types of bluing.
The process is usually complete within a few hours.  At the end the parts are soaked in oil or dried.  If dried they can quickly be painted, the Parkerizing acting as an excellent 'primer'.

Note: Bluing and Parkerizing can only be applied to the carbon or chrome-moly type steels used in firearms, and sometimes castings.  They will usually not work on stainless steels, although there are some exceptions.

Milspec CoatingMil-Spec Coatings

A relatively new process which uses a spray-on 'paint', called "Moly Resin", which has a phenolic resin base incorporating molybdenum disulphide (a superior lubricant), with a blend of additives.  The process briefly involves cleaning the parts, followed by a light bead blasting.  The coating is applied to a thickness of 0.0003" to 0.0009", and then the parts are 'oven cured' to 120-130 C. The colours available are dark grey/ black, flat black, semi gloss black, flat grey, flat green/olive, medium brown, flat tan/sand and 'stainless' silver.  The combination of olive and two of the other colours can be applied in a camouflage pattern if desired.  These coatings have passed extreme testing for resistance to saltwater atmosphere, acids and other chemicals.  This is a cost effective method of metal protection for hunting guns, etc.

(Please note the service is contracted out.)

Recoil Pads Installed

Recoil PadsWe offer high-class installation of top quality recoil pads to your favourite rifle or shotgun.  We can adjust the finished "length of pull" of the stock to your request, or to your correct fit.  The pads are ground on a jig with a purpose build disc sander, not on the stock itself.   There are to be no 'flat spots' on a pad, and all are finished with a careful hand sanding before finally being fitted to the stock.
We can usually supply whatever pad you may request.

Shotgun Chokes

We can 'open- up' the fixed choke dimension on your shotgun to achieve the pattern you want, either approximately (by guideline measurement), or by actual percentage patterns test fired with your specified or supplied ammunition.

ChokesWe can also fit screw-in type chokes to your 12-ga shotgun, depending on whether your barrel meets the dimensional minimum requirements.  Outside diameter over the choke section must exceed 0.830" with a concentric bore.
The chokes used on machined installs are the Tru-choke style.
Barrels usually don't require re-bluing after machining for tru-chokes.
* Tru-choke Thinwall style tubes are now available for barrels over 0.810" O.D. at choke section.
* Specialist tubes are available for steel, steel & lead, or lead only. Usually available in about seven sizes from Skt-1 through to X-Full. Rifled tubes for slugs are also available.

Choke AdaptorIf your single barrel shotgun has the choke section O.D. under 0.810" we can remove the existing choke section by cutting the barrel back (usually about 2" ) and machining the end to accept an 'adaptor', which is then soldered into place. The finished length is usually the same as before or slightly longer.  The barrel can be finished shorter if you request it so.  If there is a sighting rib and bead it is then re fitted on top of the adaptor.  The barrel must usually be re-blued, parkerized, or Mil-Spec coated.
All our choke installs are guaranteed to be perfectly in line with the bore.

Forcing Cone Alterations

We can lengthen the forcing cones (and chambers) on your 12ga shotgun to a more gradual taper for an increase in pattern quality and reduced recoil that results from an easier transition of the shot charge from chamber to bore. After reaming, the chamber and forcing cone area are carefully polished to aid ease of cleaning and reduced fouling.

We can also check your shotgun stock for correct fit, make alterations to the types of sighting 'beads' or most other customised features of your field or competition shotgun.

We can also undertake custom porting of shotgun barrels.

Stock Refinishing and Checkering

Stock FinishingWe provide a stock restoration service for antique and hunting firearms. The raising of major dents in the woodwork, removal of the old finish, followed by the careful 'sanding' of the woodwork to remove only the minimum amount of material possible without altering the symmetry or special features of the stock, is a task that must be undertaken with great care and skill.  A stock can be ruined by amateurish attempts at restoration, so it pays to have it done right the first time by a professional.
We specialize in oil finishes for walnut stocks in either high grade custom or hunter grade degree of finish.
CheckeringWe can also recut the old checkering on your gunstock, or cut new checkering to your requested pattern, with or without borders, up to 26TPI, depending on the density of the wood used.
(The harder, denser walnuts are usually best for holding the 'points' of finer checkering and are less prone to 'fluff' or 'whisker').

If synthetic rifle stocks are 'your thing', we can bed and finish fibreglass/kevlar synthetic blanks to fit your rifle.   We can also supply the blanks if required.
*Synthetic blanks for some rifles are not readily available, or may be unobtainable.

Custom stock making and fitting

Please see our Custom Stock Making page for full details.

'Glass' Bedding

Most modern rifles have been found to shoot more accurate consistent groups with proper 'bedding' of the barrel and action, usually with a fibreglass/ epoxy resin.  The resin is applied carefully to the prepared stock and metalwork, then brought together and allowed time to set, giving a good one-to-one matching fit of the important surfaces.  Aluminium pillars may also be used to prevent 'crushing' on wooden stocks in the action areas by over tightening of the main action screws.
A well bedded action will also be free from any bending or torsional stresses, when the action screws are tightened down.
Most centre-fire rifles shoot more consistently with the barrel free floated from the fore end, but there are a few exceptions where the barrel may shoot better if a 'pressure point' bedding technique is used at the fore end tip of the barrel channel.

Glass resin / epoxy bedding can be applied to most wooden stocks, and will bond well provided the contact areas are not soaked with oil or other foreign matter.  The bedding compounds bond well to fibreglass or kevlar synthetic stocks.  The compounds will not however bond readily to the "plastic" style injection moulded stocks, due to the grease-based nature of the plastic used.   These stocks can be bedded with some degree of success by 'dovetailing' the bedding compound into place so that it can't dislodge under recoil.  These stocks however are still inferior to a good fibreglass/kevlar one.

Silencer Installation

Fitting silencers for .22 rimfires, and suppressors for centerfires and magnum-rimfires is one of our more common jobs. We prefer to supply and fit only top quality sound-suppressors to your rifle, as this usually means less chance of complications with the installation process, and a guarantee of a quality job and end result. Phone or email us for a quote/estimate.

There are some suppressor makes out there on the market which we are reluctant to supply for liability reasons (due to quality issues, or lack of durability), but we will fit some of these suppressors if they are supplied by the customer, provided there are no obvious problems with the unit or compatibility with the rifle it is to be fitted on to. These installations are done on a 'no warranty' basis, and will be charged for the actual time spent to install the customer-supplied unit correctly.

When it comes to centrefire suppressors 'lightest' and/or 'cheapest' does not necessarily mean 'best'. Finding out later that you have to pay for a couple of replacement modular aluminium baffles that wore out prematurely (sometimes within as little as a few hundred rounds) means that any initial cost saving is gone - and you still may be left with a unit that only provides very average suppression performance for it's size.

As licensed dealers any products which we supply have to be backed by the Consumer Guarantees Act, so for liability reasons we will only supply silencers/suppressors that meet or exceed our minimum standard for quality and suppression performance.



* 'Muzzle Can' suppressors (full length muzzle forward) are available for .22 and .17cal rimfires, as well as centerfire rifles from .17 Hornet to .30-06.

* 'Over-barrel' suppressors - various models are available for centerfire rifles in .22 Hornet to .300 Win Mag., ranging from 4" - 6" muzzle forward, and 4.5" to 6.5" back over the barrel.

Note: All complete rifles supplied to us will go through the standard 40-point pre-check list and assessment before being dismantled and the appropriate machining work being performed. We have several thousand dollars-worth of specialist tooling such as centering reamers and bore pilots for every calibre in 0.0002" diameter increments. We also have two high precision gunsmithing lathes to perform riflesmithing tasks professionally and accurately, and to a high finished standard. For more information on the work involved in the barrel-threading process, check out the Rod & Rifle magazine article listed on this site. Beware that a cheap, poorly performed barrel threading job can ruin accuracy and lead to other problems, which could be avoided by having the job done correctly first time by a qualified professional. It is not simply a job for the average general engineer or lathe-hand who does not have the specialist tooling or knowledge to be able to perform the job correctly. Unfortunately we see dozens of rifles every year with botched-up or poorly executed barrel threading jobs. Don't let you rifle become another one of these. In an industry that is basically un-regulated, you do need to be very careful about where you send your guns out to for work to be done. We take pride in doing a first-class barrel threading job for your suppressor or muzzle brake installation, every time.

Rebarreling and Accurising   Barrel

We offer a rebarreling service for rifles of all types.  Usually we supply only match-grade barrels as the time taken in precision fitting them to the action is the same as for the cheaper ones.  The price difference is usually not sufficient to justify anything of a lesser quality and risking the possibility of poor accuracy.
'Accurising' the action basically involves 'truing' or correcting any dimensional inaccuracies which are very commonplace in factory mass-produced actions, especially older military ones which may take a lot of work to bring up to acceptable standard.  This work must be completed on the action before the barrel is to be fitted.  We offer most of the common chamberings, special chamberings may be accommodated on request, however this may be at extra cost.

Barrel Chart

barrel shank    Once your new barrel has been fitted the calibre designation is engraved (not stamped) on the barrel shank as a finishing touch. This is not only tidier, but does not induce any stress into the surface of the barrel steel.

Chamber Reamer List

Click here to view our current chamber reamer list. Chambers not listed here may be available on special order.

Information on barrel fluting

Click here to view our fluting notes.

P1010655 P1010656 P1010657
P1010633 P1010874 P1010872

Notes on rifle barrel fitting:
The accuracy potential of a good barrel blank is only as good as the gunsmithing employed to install it. To further improve the quality of our barrel fitting we have recently (late 2007) installed a GTRtm chamber flushing system to our lathe for barrel fitting. A chamber reamer receiving constant coolant fluid pumped under high pressure from the muzzle, down the bore and out through the reamer, ensures that tolerances are kept to a minimum, while also producing an outstanding finish and increasing tool life. No swarf ever travels down the bore which may mar the finish, and ring marks in the chamber walls are non-existent.
Our barrel fitting is usually done 'between centres' utilising a custom-made floating reamer guide and high quality interchangeable-pilot chamber reamers, ensuring that all chambers cut are perfectly concentric and in-line with the bore.

Note: If necessary, we are also setup to chamber 'through the headstock' after carefully 'dialing-in the bore', for certain applications where this may be required. i.e. - for re-chambering jobs, for extra-long barrel or super-match installs, or for dealing with non-straight barrel bores.

Hunting Rifles

With the rapid rise of the cost of new rifles, many hunters want a reliable hunting rifle with good accuracy, but without the hefty price tag.  Whether you're just starting your hunting career, or simply wanting to upgrade from your present rifle, we can build a rifle to meet your budget or your specifications.
If you want a reliable hunting rifle without a large cash outlay we may be able to convert one of the good military Mauser rifles to sporting configuration to suit your purposes.  Alternatively we can rebuild a used commercially manufactured rifle, either by rebarreling it in the calibre of your choice, and /or restocking and bedding, fitting new trigger or sights, etc.  This is a popular option, especially for those wanting to have a rifle built up in a special calibre that may not be available in an 'off the shelf' factory rifle.

Hunting Rifle

Walnut or synthetic stocks are usually available, or can be made up to suit. Of course the overall cost depends on the time involved to build the rifle to your specifications and the cost of the components used.  Naturally a price can only be estimated after discussing your options and quoting component costs at the present time.  Quality workmanship with care and attention is always guaranteed.

Muzzle Brakes

See our Muzzle Brakes page for more information.

© 2012 - D.F. Maisey. No photos or other information may be reproduced or copied without the written permission of D.F. Maisey