DANIEL DEFENSE M4A1 STATE REGULATED NO MAG a Finish: MIL-SPEC Cerakote Dark Brown a Carbine-length Gas System a MIL-SPEC heavy phosphate finished 4140 steel pinned low-profile gas block a M16 profile BCG a MIL-SPEC trigger a MIL-SPEC heavy phosphate finished barrel M4 profile a Pinned & welded DD Flash Suppressor Extended a DD M4A1 RIS II quad-rail (12.25 Rail Interface System) a Includes heat-resistant Santoprene rail panels a OAL: 31.50-34.75 a Wt.(lb): 6.74 DD COMMON FEATURES a 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