AR-15 5.56/.223 16" M4 "BLACK SHARK" UPPER ASSEMBLY. We ship across USA.
Barrel: 16" M4 contour, 4150V steel, chrome moly, heat treated, black, M4 feedramps, .750 gas block diameter.
Gas System: Carbine Length Gas System
Chamber: .223 Wylde (5.56 NATO/.223 REM)
Twist Rate: 1/8 button rifled*
Muzzle Device: Thread 1/2 X28 custom steel shark muzzle brake 4"
Handguard: Rifle-length Keymod (12") Free Float
A3 flat top upper receiver - Made from certified 7075-T6 aluminum forgings, black hardcoat anodized to gov. specs.; forward assist and dust cover installed
*The twist may vary between 1x8 and 1x9, based on stock availability. Does not come with BCG and Charging Handle. May be purchased separately.