It didn't take long after the debut of their APC9 platform for requests to begin flowing in for a larger framed version chambered in the ubiquitous 5.56 NATO cartridge. B&T began work immediately" incorporating all the features and benefits found in the APC9" creating a truly state of the art" fully ambidextrous assault rifle. The APC223/556 utilizes a piston operating system optimized for use with a suppressor and can be regulated by way of an adjustable gas valve. It can be tuned as the weapon becomes increasingly fouled due to heavy firing schedules or prolonged use with a suppressor. The piston design not only increases the reliability of the operating system in adverse conditions" but also traps less gas within the system. What gas remains is expelled forward of the shooter" making the platform not only more comfortable to shoot suppressed" but it's also healthier for the shooter. Just like the APC9" the APC223/556 rifle caliber platform utilizes a hydraulic buffer system to significantly reduce felt recoil and muzzle rise" all while providing increased terminal performance" intermediate barrier penetration and sheer energy on target - all in a size optimized for discrete deployment. APC rifles caliber platforms are compatible with a myriad of B&T accessories to include folding/telescoping stocks" interfaces" handguard enhancements" optic mounts" and suppressors. Thanks to the modularity of the system" APC223/556 accessories are quickly and easily replaced/installed at the user level" allowing you the ability to configure the platform to your specific mission.