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Mine have worked great. Took awhile to break in the mags so I only loaded them to 15 or so rounds initially. Black Dog mags also work well. Here's another thread on the conversions.
or buy a dedicated cmmg upper in 22lr with the bolt/barrel kit. Expect MOA with that. I love mine. I use it on my SBR.Buy one.
They're great for plinking.
Run it wet. Type A Tranny fluid works well.
Don't expect MOA.
Buy the gray magazines. They are usually cheaper and you can dye them black with Ritz Dye.
* Do not use any types of solvents on magazines with plastic feed lips.