Like most conversion kits that you can buy, this includes a Picatinny rail upper for a variety of attachments. The Sage chassis Using the M1A SOCOM 16 CQB that would quickly occupy it. Each week later, it showed up on my doorstep. I was just like a kid at Christmas. https://simonhtenv.ageeksblog.com/26573847/the-definitive-guide-to-m14alcs