Maintenance instructions for DPT modular Mk1 & Mk2 suppressor.

Please make sure that the suppressor is firmly screwed onto the front of your rifle. After every few shots, check for tightness. If the suppressor comes loose and drops down into the line of bore, a baffle strike could occur and cause irreversible damages. The suppressor needs to be snug against the thread shoulder. If your muzzle thread has no thread relief, this may be a problem. If so please contact us. A light coat of oil should be put on the muzzle thread before the suppressor is screwed on. For the over barrel versions, the plastic rear bushing is recommended to be machined 0.05mm oversize, the bush should float around the barrel, a tight bush or bush that contacts the barrel may cause accuracy issues. A larger clearance fit is acceptable if the muzzle thread is a nice firm fit with the suppressor and has been machined true to the axis of the bore.

To obtain the extended warranty, your suppressor must be regularly maintained and cleaned. The inside of your rear chamber and both faces of the baffles must be sprayed with a thin coat of WD40 after every day out shooting (do this at the same time you clean your rifle) and also before long periods of storage. To do this, you will need to remove the baffles from the rear chamber and disassemble the baffle stack, failing to do this will void the extended warranty. In short, treat the suppressor as you would treat your rifle. Alloy baffles do wear gradually over time and are treated as a consumable, they are not covered by the extended warranty.

Cleaning of the modular suppressor can be done by unscrewing each module. Ensure that the thread surfaces are clean. Grease the O ring and threads with lithium grease before re-assembly. Don't over tighten the modules, firm is enough. Due to the fact that the front module and cap are loctited together, as well as the rear section on the over barrel versions, it can’t be undone. Cleaning will need to be done with a nylon barrel cleaning brush through the ports. WD40 should be used to clean the suppressor. Don’t use any harsh chemicals or water based products.

If the modules are too tight to undo, you can make a couple of clamps with two hose clamps. Make sure you protect the suppressor with some leather or cardboard. We also offer a clamp set for sale that is listed on our website.

During shooting, condensation is created inside the suppressor, containing amongst others ammonia (mixture of burnt powder and water). Failure to remove the suppressor within a reasonable period of time after shooting will cause rust to form in the gun barrel and could cause corrosion inside the suppressor. It is therefore practical to unscrew the suppressor after shooting on a range before packing the firearm for transport. When hunting, the suppressor must be removed after the end of the hunt. Store the suppressor so that air can flow freely through it and dry it out. If the suppressor is put away wet, a white powdery build-up will occur on the baffles. In this case spray WD40 over the baffles. When the suppressor is dry it is advantageous to spray WD40 into it. Avoid the build-up of moisture inside the suppressor as repeated exposure could lead to premature failure of the suppressor due to corrosion. If the suppressor is dropped into water, it must be fully dried before use.

After the first 20 or so rounds, you may find pitting on the module closest to the muzzle. That is nothing to be concerned about. After the initial pitting, you will find the rate of wear will slow down. A stainless-steel blast baffle is recommended if you plan on putting 100+ rounds a year through the suppressor or you have a short barrel, ie: 17” 308, 20” 270. Life expectancy of the suppressor can be improved by not allowing it to become too hot. The suppressor can handle a maximum average round count of 70 rounds an hour or 35 rounds an hour if a protective sleeve is used on the suppressor (due to lack of heat dispersion). If a stainless-steel blast baffle is used, the round count goes up to 100 rounds per hour without a sleeve or 50 rounds per hour with a sleeve.

Additional modules can be purchased to increase the sound suppression. A maximum of 7 baffle modules can be used on the muzzle forward suppressors and 10 modules on the over-barrel suppressors.

Rear bushes are the only parts interchangeable between Mk1 & Mk2 suppressors

Suppressor case capacity ratings:

-Rimfire suppressors up to 22 Magnum or 17 HMR case capacity

-Mini centerfire: cartridges up to 308 in case capacity (this is a non-standard suppressor and only for special order)

-Muzzle forward and Standard Over barrel centrerfire: cartridges up to 30-06 case capacity

-Magnum Over barrel centerfire: cartridges up to 300 Winchester Magnum case capacity

-Ultra magnum Over barrel centerfire: Cartridges up to 338 Lapua Improved case capacity

DPT suppressors are covered by a limited lifetime warranty, see terms and conditions on our website www.dpt.co.nz Any problems contact DPT through the website www.dpt.co.nz