Breakthrough Clean Technologies Lower Block AR-15 Green/Black BT-AR15LVB. By inserting it into the magwell it provides a snug secure fit effortlessly locking in place using the receiver's magazine lock. This block can be easily clamped onto any vise...
Breakthrough Clean Technologies Lower Block AR-15 Green/Black BT-AR15LVB. By inserting it into the magwell it provides a snug secure fit effortlessly locking in place using the receiver's magazine lock. This block can be easily clamped onto any vise...