Bushmaster 90025 Complete Upper Assembly Minimalist-SQ 223 Remington/5.56 NATO 16" 4150 Chrome Moly Vanadium Steel

The Bushmaster XM-15 Minimalist-SD is built on the versatile Bushmaster modular MSR upper platform. The barreled upper receivers can be used on existing MSR-type lower receivers, all receivers feature integral brass deflectors. The 4150 chome-moly-vanadiem steel barrels feature hard-chrome lining in both bore and chamber for extended barrel life.The XM-15 5.56 features a free-floated rifle length SquareDrop handguard, AAC Blackout flash hider and a lightweight gas block.