My "free" SilencerCo Octane 45 HD was approved on 06/01/2020. Now I'm just waiting on the stamp to make it to the shop. And I have to pick up some pistons. The 1/2 x 28 seems to be sold out at a lot of places. I've heard Rugged pistons and SilencerCo pistons are interchangeable. If so, that may increase my chances of finding one. Does anyone have any experience with those pistons? Are there any other interchangeable pistons?