Griffin Armament PSD Upper Receiver Assembly AR-15 9.5″ 300 AAC Blackout

416R SS barrel manufactured from stress relieved certified barrel steel
Black nitrided for extended service life
Magnetic particle inspected
Button rifled
300 Blackout chamber
Pistol gas system
.750″ gas block journal
M4A1 diameter for reduced POI shift / Increased Accuracy & Durability
Air gauged and hand lapped bore
Polished chamber and M4 feed ramps
TRU-BORE suppressor quality threads
Suppressor optimized gas ports
.625″ , 1/2×28 industry standard threads