I just bought a .22LR conversion kit from Stag arms. Ordered it Monday and got it on Wednesday.
I am pretty sure it is a rebranded CMMG stainless kit. The forward assist adapter thingy says CMMG right on it.
I took it to the range tonight and put about 150 rounds through it as fast as I could reload two magazines. Not a single failure, which is more than I can say for any of my other .22's.
My 16 year old shot about 4 mags through it and decided she hates it. Not enough noise. I let her shoot a magazine of 5.56 after we were done, which put a big smile back on her face.
So far, I am really happy with this thing.