<p>DANIEL DEFENSE DDM4 ISR •Finish: MIL-SPEC Cerakote Dark Brown •Pistol-length Gas System calibrated for the integrated suppressor that greatly reduces muzzle blast & flash •High-temp Cerakote-C finished suppressor tube •User-serviceable baffle core •M16 profile BCG •Chrome-lined barrel S2W Profile •Integral suppressor extends barrel l” •DD MFR XL 15.0″ handguard w/KeyMod attachment points at 3/6/9 o’clock positions) •Includes (” Picatinny rail sections •Barrel Length w/Welded Suppressor: 16″ â€�” twist •OAL: 3″-34.75″ •Wt.(lb): 7.6 •NOTE: DDM4 ISR is NOT classified as SBR & only requires ONE tax stamp DD COMMON FEATURES •Direct Impingement Gas System •MIL-SPEC 7075-T6 aluminum receivers •Optics-ready flat-top upper w/indexing marks & polished M4 feed ramps •Enhanced flared magwell •High-Pressure Tested (HPT) MPI (Magnetic Particle Inspected) & chrome-lined Bolt Carrier Group (BCG) •Cold hammer-forged Chrome Moly Vanadium steel barrel •Salt Bath treated 17-4 PH stainless steel muzzle device •Bolt-Up System clamps rail to receiver w/(4) Grade 8 MIL-SPEC fastners •Aircraft-grade aluminum Free-float Rail System w/full-length Picatinny top rail •DD Enhanced Buttstock •DD Enhanced Pistol Grip w/ergonomic wrist angle & integral oversized trigger guard •MIL-SPEC 6-position receiver extension & buffer spring •H-Buffer •QD swivel attachment points â�</p>