FN BARREL AR-15 BUTTON RIFLED

10.5" 1:7 CARBINE GAS GOVT. 14.7" 1:7 MID-LENGTH GAS GOVT 16" 1:7 CARBINE GAS GOVT. 16" 1:7 MID-LENGTH GAS GOVT. 18" 1:7 RIFLE GAS GOVT. 20" 1:7 RIFLE GAS GOVT. 14.7" 1:7 CARBINE GAS M4 16" 1:7 CARBINE LENGTH GAS M4