Of the various industrial .308 Winchester masses, handful of, if any, are suitable for barrels shorter than sixteen". The one which follows allows tackle this gap when remaining easy to suppress and light around the wrists. The barrel is supported by a dual recoil-spring assembly reminiscent of the Gen4 Model https://glock-with-a-switch58888.wiki-jp.com/1620296/the_2_minute_rule_for_glock_with_a_switch