Other cool things on this is that it had exactly one roll pin in the entire setup and that was in the gas block. CMT made building the lower just flat out EASY. You can take the bolt catch on or off with a little supplied allen wrench. No punches, no hammers. If you need to fix, repair, or adjust your mag release...with the other ones you should try and get it right the first time. With CMT you can take it all apart and put it back together while sitting on your bed.

I bought exactly two tools for the whole process. One was a no mar upper vice block and the other was a castle nut wrench. The rest of it is put together using standard tools, and almost always the manufacturer included whatever tool you needed with whatever part it was you were putting on. But with a book of allen wrenches of different sizes its a snap.

The SLR Rifleworks rail is literally a thing of beauty. The barrel nut gets tightened down with a standard 1 1/4" open ended wrench or crescent wrench. It does not need to be timed. You can technically take the barrel off and put it back on (if you are careful) without ever removing your gas tube. It's a pretty neat set up.