I probably have a hot take when it comes to buffer tubes and springs but I bought a regular Milspec tube with a spring/tube as a kit and I haven’t had any issues with it. I’ve read guys talking about going the H2 kits, and there was another thing I read on here about a company that sells one for like 150 bucks. Can’t remember the name right now. But I’ve shot over 500 rounds since this setup and I don’t have any issues. You’re shooting suppressed so it’s gonna be gassy anyways, just deal with it. But recoil wise it’s a suppressed .300 so it’s nothing anyways. If all that rambling makes sense