The SMG model is built on an AR platform with innovations and high performance features you expect from an LWRCI. It is designed on LWRCI's proprietary short recoil/delayed blowback operating system the new SMG is lightweight - 5.9 lbs and compact folding to a mere 15.3". The SMG .45 Pistol design features compact ergonomics with unique performance features including: an 8.5" cold hammer forged chromoly steel barrel, fully ambidextrous lower controls, Magpul MBUS Pro SIghts and more.