Live Free Armory LF-15 .223/5.56 16" 1-7 Twist OD Green. The Live Free Armory LF556 Battle Rifle-Lite (BRL) AR15 sports a 16 inch barrel chambered in 5.56x45 with a 1:7 twist to maximize accuracy. This LF556 offers reduced recoil, both perceived and felt, through a mid-length gas system that provides smooth and reliable cycling under any condition. Engineered with an M-LOK attachment, points run along three positions and there are four QD sling attachment points, providing lots of room for sights, optics and accessories. Purpose-built, Live Free's Battle Rifle Lite offers all the features shooters require for accurate, reliable service in all situations.