This isn’t a preinstalled adapter but a decrease receiver using an integrated folding mechanism. It really works with standard shares, buffer tubes, and everything. The FoldAR system retains recurring zero following folding and unfolding a great number of instances, and FoldAR has utilised impartial 3rd-get together testing to confirm this. https://mylesbecbx.blogofchange.com/33391558/new-step-by-step-map-for-where-to-buy-a-switch-gun