LWRC SMGP45B8S: 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.