DANIEL DEFENSEDDM4V1 BULLET BUTTONa Barrel Profile: M4 a Finish: Black Anodizeda Carbine-length Gas System a M16 profile BCG a MIL-SPEC trigger a Salt Bath Nitride treated 4140 steel front sight base a Aluminum A1.5 fixed rear sight a MIL-SPEC heavy phosphate finished barrel a DD Flash Suppressor a DDM4 Rail 12.0 FSP (12 quad-rail w/front sight post) a DD Enhanced rail-mounted vertical foregrip w/dual O-ring watertight storage compartment a Includes heat-resistant Santoprene rail panels a 1:7 twist a OAL: 32.25-35.875DD COMMON FEATURESa Direct Impingement Gas System a MIL-SPEC 7075-T6 aluminum receivers a Optics-ready flat-top upper w/indexing marks & polished M4 feed ramps a Enhanced flared magwell a High-Pressure Tested (HPT) MPI (Magnetic Particle Inspected) & chrome-lined Bolt Carrier Group (BCG) a Cold hammer-forged Chrome Moly Vanadium steel barrel a Salt Bath treated 17-4 PH stainless steel muzzle device a Bolt-Up System clamps rail to receiver w/(4) Grade 8 MIL-SPEC fastners a Aircraft-grade aluminum Free-float Rail System w/full-length Picatinny top rail a DD Enhanced Buttstock a DD Enhanced Pistol Grip w/ergonomic wrist angle & integral oversized trigger guard a MIL-SPEC 6-position receiver extension & buffer spring a H-Buffer a QD swivel attachment points a Full-latch Impact plastic case a Magpul PMAG a Made in the USA