Each SAM7SF receiver is milled from a hot-die hammer forged receiver blank by Arsenal Bulgaria. Arsenal's hot-die hammer forging produces stronger and finer-grained steel. Internal voids and cooling deformations are eliminated by the 5-ton hammer forging process. Each forged receiver blank requires over 5.5 hours of milling before assembly. This forging and milling process is complex and time-intensive but Arsenals meticulous attention to detail delivers a receiver of unequaled strength precision and durability. - Includes FM-922EUS the Enhanced Fire Control Group (FCG) for AK and RPK-based rifles. FIME's Enhanced FCG includes a single-hook trigger hammer disconnector disconnector springs. FIME's Enhanced Fire Control Group delivers shortened trigger travel with an extremely smooth and light trigger pull. To prevent lever misfires the disconnector face makes full contact with the hammer. Further the disconnector is engineered with an elongated tail which makes a full stop on the rear trigger guard rivet and the hammer stop prevents the hammer from slamming on the trigger. With these two designs functioning together it eliminates the trigger slap found in competing products. - Shipping Weight: 11.35 lbs - Manufacturer: Arsenal Inc. - Caliber: 7.62 x 39 mm - Total length: 38.2 in. (970 mm) - Folded length: 28.35 in. (720 mm) - Barrel length: 16.33 in. (415 mm) - Rifling: 4 grooves - Twist rate: 1:9.44 (1 in 240 mm) - Weight w/o magazine: 8.5 lbs - Muzzle velocity: 2329 fps (710 m/s) - Maximum range: 1350 m (1480 yds) - Rear sight range: 800 m (875 yds) - Rate of Fire: 40 rds/min (practical) - Receiver: Milled Receiver - Fire Control: FIME Enhanced Trigger - Finish: Black Plum - Magazine: 30 Round - Threads: 24x1.5mm RH