I wanted a thread to keep up with my RDB. I picked it up last week and put 9 rounds through it. No sights. The bolt locked open on last round. So I went through my parts bin. I found a set of Magpul BUS and mounted it. And put some rail covers on. Took the KSG AFG that was on Black Betty (My S2K-40 parkerized Glock mag) and put it on the bottom rail. This is only experimental. This gives me a short and long grip options.