How's it going guys, was just looking for some quick answers before buying a rear iron sight, so I don't look like a jackass at my local gun store I got a question, I recently purchased a front clamp on flip up iron sight for my vmatch gasblock, It sits on my bushmaster predator, I was just wondering if I go to my local gun store can I buy any rear flip up sight? I might not get alot of answers because no one really knows what the heck a clamp on iron sight is lol but if you have any knowledge of this topic of iron sights please share, appreciate any input thank you for reading take care