2,000 rounds thru it and it is still working great. - CMMG 22LR Mk4 Barrel Kits w/ Bolt Group

I did a little customization to my setup so I could run the Smith and Wesson M&P 15-22 mags. I had to use the Boonie Packer Better Mag adapter to get the M&P mags to fit and cycle properly but now it runs great and the bolt catch/release functions properly and it will hold the bolt back after the last round. It feeds and fires whatever ammo I put in it, will rapid fire with no issues and is pretty accurate. I built this dedicated 22LR-AR with identical parts my 5.56 AR so I could practice on the same platform with cheaper ammo and now it gets used a lot more than my 5.56.