It's actually not a conversion of the lower at all. All parts on the lower are completely the same. It's actually a magazine conversion where you swap out Pmag guts and your standard lower can run 9mm.

No blocks, no anything except a standard lower, a standard 9mm upper-- and of course the PMag conversion kit. Just change the guts out of a magazine and you can run it on an already SBR'ed lower.

I am on the fence about a 9mm AR, but if this proves to be reliable over time I could see myself building a 9mm upper and going from there. It's a way to dip my toe in the water before I go out and SBR a lower for something I am not entirely sure about. If I wind up liking 9mm ARs I could just use the same upper and build a dedicated lower for it later. I will be watching to see how this turns out.

It's not entirely compatible with some of the various 9mm upper systems but the 'basic type' it is. Pretty cool if it works and is reliable. Fun option for a range toy for sure.

What do you guys think?