This isn’t a preinstalled adapter but a lessen receiver with an built-in folding system. It really works with standard shares, buffer tubes, and all of that. One other difficulty which i undecided if some other model has solved but when adding swift disconnect shoulder strap the qd adapter is urgent https://folding-gun46666.blogdiloz.com/31911457/new-step-by-step-map-for-where-to-buy-a-switch-gun