Ask the Community

Dennis, you can but this one has a polymer upper and lower, I don't really trust polymer receivers. So if you plan on swapping uppers I'd stick with the radical firearms one. But no trick to it, you can just buy a complete upper or build one and just swap it with this one. Hope this helps.

Dennis, the polymer upper and lowers are usually slightly thicker which is the problem you are likely running into. Been down that road before and not much you can do. Cheers and stay safe!