A must have if you run jp silent capture - JP Enterprises SCS System Buffer Retainer Pin & Spring Kit

While not required to have in order to run a JP silent capture buffer, it does make things easier. Without this, the silent capture buffer will slide freely out while disassembling your rifle. Its more of a pain than anything, especially if you're just oiling up. This holds it in place, and honestly, should be included with a silent capture buffer purchase as a standard accessory. I'll knock a star for that alone.