TM- SPR Sound Suppressor

WARNING: FAILURE TO READ AND UNDERSTAND THIS

MANUAL PRIOR TO USE MAY RESULT IN DEATH, INJURY, OR DAMAGE TO PROPERTY

Griffin Armament / Hearing Protection LLC.

the mounting bore between uses will prevent that. The carbon steel

bristles have higher strength helpful in removal of hard, baked on, copper fouling. Make sure you clean the front flash hider support

forward of the threads, as this is a second bearing surface for the

mounting system.

Finish: High rate of fire operation at temperatures exceeding 1100F

after firing more than 110 rounds in 1-3 minutes, may damage the

finish which is Norrell Moly coating and has a minimum thermal breakaway of 1000F. If refinishing is desired, rub the old loosened,

heat affected paint off with rubbing alcohol and a clean rag and apply

the finish of your choice. We recommend Norrell Moly. Use a light coat with the silencer standing on the rear cap. Painting the mount

bore, or threads will result in tolerance interference, rendering the unit

inoperable till interfering coating thickness is removed.

CAUTION: The SPR Silencer combats the Impulse noise at the

muzzle of your weapon and cannot account for the action’s associated

operating noise which will vary by weapon type, system wear, and barrel length. For the highest level of hearing protection, wear

hearing protection at all times while using your silencer.

MILITARY USE: In operational environments where concealment

is paramount, first round flash can be mitigated by firing the weapon

with the suppressor mounted, prior to an operation, and immediately taping the muzzle aperture of the suppressor to trap combustion gases

(an oxygen free environment). Additionally the optional very light

coat of oil from the maintenance section will reduce first round flash as well. Some field testing should be conducted, ideally, to derive the

particular strategy that works best for your unit.

Infrared heat signature can be mitigated by using a suppressor cover

such as the SUPCOV. For optimal concealment less than 30 rounds

should be fired. Covers insulate, adding thermal stress to the

suppressor and reducing cooling. Reduced cooling reduces tolerable maximum ROF, so covers are not recommended unless needed to

reduce thermal signature or mirage (with scoped rifles) or to mitigate

risk of burns during transition drills.

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Confirm alignment! Following the instructions in the included but

separate, “RSTA [/ SPR] Muzzle Brake Flash Suppressor” manual, clear your weapon and confirm alignment on each new weapon prior

to the first use of your SPR suppressor with un-tested weapons. This

will safeguard your suppressor from damage caused by a poorly

machined barrel thread. If alignment does not appear to be right, or if you desire the most minimal POI shift and maximum safety from

baffle strikes or other issues, send your barrel to ADCO firearms in

Ohio for barrel threading. www.adcofirearms.com

Recommended rate of fire considerations: The SPR is constructed

of TIG welded high strength, high temperature corrosion resistant, aerospace alloys. Your SPR is extremely durable; however care

should be taken to prolong service life. The recommended maximum

rate of fire is no more than 81 rounds on full auto, followed by 14

rounds per minute sustained.

Do not quench/cool your heated silencer with water, ice, or snow.

Quenching metals will em-brittle them, can warp parts, and may damage or destroy your silencer. Allow your silencer to air cool.

Calibers and Ratings: The SPR 5.56mm sound suppressor used in conjunction with 1/2x28 threaded mounts, is rated for:

5.56x45mm ammunition and all lesser calibers in barrels down to

10.5” (however over the barrel mounting and gas block positioning

will probably reduce SPR possibilities to 12.5”).

Maintenance: Clean your suppressors mounting system and muzzle

device after every use to ensure mating surfaces are free of copper and carbon fouling. Failure to clean the mounting system can result

in your SPR becoming stuck to the muzzle device on your weapon.

No other maintenance is required with this silencer. If the silencer for

whatever reason becomes filled with water, shake out excess water in the direction of the rear mount and store unit muzzle up to dry. A

standard nylon bristle, all purpose brush should be sufficient for

cleaning rear mount threads, while an Oatey No. 31328, 3/4 inch Heavy-Duty Inside Diameter Fitting Brush can be used to clean the

mount surfaces further inside the suppressor. This brush is available

for $2.20 currently at Home Depot in the plumbing department, and can be purchased online from other retailers. The brush has carbon

steel bristles, so residue left on the Stainless mount geometry by the

brush may give the appearance of light rust- Application of CLP to

Thankyou for purchasing a SPR sound suppressor. We appreciate

your business. Please read these instructions carefully prior to

use.

WARNING: Your SPR has a 5.56mm bore- interfacing it with a

7.62mm RSTA mount and firing 7.62mm projectiles will destroy your suppressor and could very possibly result in injury or death to the

firer and / or bystanders. DO NOT INTERFACE your 5.56mm SPR

with 7.62mm weapons.

Compatibility: The SPR suppressor requires a SPR flash suppressor

or muzzle brake mount of the appropriate caliber and thread pitch. 5.56mm mounts are threaded 1/2x28. The SPR mount was designed

for a typical thread length of 0.630”. Barrels must be no greater than

.775” OD a minimum length of 2.55” rear of the front of the barrel’s

muzzle, for compatibility with mounts.

Muzzle Brake / Flash suppressor mounting: See the included, but

separate, “RSTA [/ SPR] Muzzle Brake Flash Suppressor” manual for

brake or flash suppressor mounting procedures to ensure optimal

compatibility with the SPR suppressor. Proper muzzle accessory mounting procedures are required to ensure safe use of your

suppressor.

To mount your SPR suppressor: Carefully place the suppressor

over the SPR muzzle accessory. The silencer will bottom out when

the threads on the suppressor’s rear mount touch the threads on the

SPR muzzle accessory. When this occurs, engage the thread by rotating counter clockwise until you feel the starting point of the

thread. Next tighten the silencer by rotating it clockwise 4-6 rotations

until the silencer’s tapered collar engages the front support. Tighten the suppressor firmly.

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