SPR Model Suppressor shipped directly from Advanced Armament, this item is no longer in production! Exclusive! TECHNICAL SPECIFICATIONS 4) Clean shoulder of barrel and exposed barrel threads thoroughly with solvent. Rust, grease, oil, and other contaminates MUST be removed. 5) De-grease and dry the threads on the inside the AAC Flash Hider. 6) Apply and distribute one or two drops of ROCKSETT sealant to the muzzle threads of the weapon and the threads inside of the AAC Flash Hider. ATTENTION Once ROCKSETT sealant has been applied to the mating parts of the host weapon muzzle and the AAC Flash Hider, the parts must be assembled quickly. 7) Screw the AAC Flash Hider onto the muzzle threads until it bottoms out on the host weapon muzzle or the shoulder behind the muzzle threads. 8) Adjust the torque wrench for a value between 20 and 30 ft-lbs. Using the torque wrench and 11/16" adapter, torque the AAC Flash Hider onto the host weapon barrel. 9) Wipe away any excess ROCKSETT sealant. Allow sealant to cure for 24 hours for best results. INSTALLATIONOF SPR/M4 SILENCER 1) Set the weapon select lever on "SAFE", remove the magazine from the host firearm, lock the bolt to the rear, and visually inspect the chamber to ensure it is empty and the host-weapon is unloaded. 2) Inspect the threads on the exterior of the AAC Flash Hider and interior of the SPR-M4 Silencer to ensure they are free of obstructions and undamaged. Caliber Silencer Materials Flash Hider Materials Length (O.A.) Length Added to Weapon Diameter SPL Reduction Silencer Finish Flash Hider Finish 5.56mm & 6.8mm 718 lnconel & 316L SS High Temperature SS 8.625 in. 4.90 in. 1.5 in. 33 - 36dB Matte Black SCARmorThe SPR-M4 Silencer and Flash Hider system is designed to reduce the sound and visible flash signature of 5.56 x 45mm and 6.8 SPC small arms. The system is comprised of an AAC Flash Hider or Muzzle Brake and a SPR-M4 Fast-Attach Silencer. The silencer utilizes the M.l.T.E.R. (Multi Indexing for Targeting at Extended Range) fast-attach system that enables users to securely install the silencer in any one of five different rotational orientations with minimal effort in under three seconds.