The SR-30 takes advantage of the .300BLK cartridge, enabling a 9.5” barrel to be as capable as an 11.5” 5.56mm SBR. The Mod 2 gas block is secured with a locking ring, which results in a more rigid barrel due to the elimination of taper pin grooves, and removes the need for individually ­ fit gas blocks. An improved E3 round-lug bolt design enhances function and increases bolt life far beyond the industry standard. The URX 4 handguard reduces weight through use of negative-space mounting systems and an integral barrel nut. An ambidextrous bolt release, selector and magazine release offer left-handed users the ergonomic advantages inherent to AR-15 based controls. This also provides the right-handed users alternative methods of manipulation to increase efficiency of movement. The drop-in 2-stage trigger serves double duty as an aid to precision marksmanship while enabling surgical speed shooting at close range. KAC QDC-supporting muzzle devices are included, and the rifles are ready to host a suppressor with no permanent changes needed to ensure long-term reliability. Receiver end plate with ambidextrous QD sling swivel sockets, 6-position collapsible stock, fully ambidextrous lower receiver controls, extended charging handle latch, folding front and 200-600 meter rear micro sights are standard features of the SR-30.