POF 01146: POF-USAP415 EDGEa Tungsten Gray Cerakote finisha Semi-Auto Short-Stroke Gas Piston System with 5-position adjustable gas block a 1-pc NP3 coated BCG design helps reduce carrier tilt a Roller Cam Pin with NP3 coated roller head eliminates friction & prolongs the life of the upper a GEN 4 Lower Receiver a Single stage non-adjustable 4.5 lb. drop-in trigger system with KNS PrecisionA(R) non-rotating anti-walk pins a Modular Railed Receiver(TM) (mmr) a Edge Series low-profile 14.5" M-LOK(TM) free-floating aluminum handguard rail with integral top & bottom 5-slot picatinny rails & ambidextrous QD sling mounts a Triple-port muzzle brake with five strike prongs a MFT Battlelink Minimalist adjustable stock pistol grip & polymer mag (All Black)SEMI-AUTO Standard FEATURESa EA^2 Dual Extraction Technology ultimately extends the life of the extractor & overall reliability of the rifle system a Chrome plated bolt extractor & firing pin a Nitride heat-treated match-grade chrome-moly barrel a Oversized heat sink barrel nut a MIL-SPEC anti-tilt buffer tube with three drain holes a NOTE: NP3 Finish combines electro-less nickel alloy plating & Teflon(TM) for smooth perfectly even self-lubricating surface inside & out that prevents friction wear & corrosion