BOONIE PACKER PRODUCTS - Better-Mag S&W .22 Mag Adapter

Absolutely amazing. Bit fiddley to install but works every time. Ive tried it in BCM, Daniel Defense, Spikes and Colt lowers. Fit in all of them with zero issues. I love the cmmg bolt but the mags they function perfectly, however loading them takes the fun out of it. The S&W mags are a breeze to load and the bolt hold open works as it should rather than catching on the follower like the cmmg do. All in all super pleased with this combo for the ultimate 22 conversion. Brownells should do a package deal, cmmg bolt - better mag - 15-22 mag.

I wanted to use my service rifle lower with a CMMG-equipped .22 upper for rimfire sporter matches. I already had MP15-22 magazines and wanted to use those. The Better Mag Adaptor was the answer...it fit perfectly and runs flawlessly...at least for the last two matches anyway. It fits snugly in the Polymer 80 lower that I'm using in a 4-1/2" pistol but it works fine in that too. I'd get a second one but $55 is kinda pricey.

Works excellent. I have a CMMG conversion kit. The problem with the cmmg is the magazines. This conversion to M&P15-22 Kit does the job very well. Ran 1000 rounds so far, and almost flawless. The last-round-hold-open does work most of the time. I had a few times where it didn't, but no biggie. And sometimes after I first reassemble my rifle, it doesn't wanna work at first, but after the first mag, it will hold open just fine. My only real complaint was how sharp all the edges are. They are FN sharp. I will be filing them all down shortly, but it's something that should have been done at the factory. It's not the easiest thing to convert back and forth, as I'm afraid of losing the tiny bolt catch piece. Originally I was gonna switch back and forth between the CMMG's and 15-22's. But this thing works so well, it's staying put. Well worth the money. It just works. If I get another cmmg conversion kit, I'm definitely gonna order another "better mag" mag adapter.

Have an AR-15 with a dedicated CMMG .22LR upper that was VERY unreliable (usally 2-3 failures to feed/jams per magazine) with all types of ammo and after several 100 rounds to break it in. Shot yesterday 150 rounds with the Better-Mag and S&W magazines and it ran GREAT! I did have some issues (4/6) getting the first round to chamber by using the bolt release. Pulling and releasing the charging handle would then get it to load (one time I had to do this twice and then push the bolt with my thumb). Also, it seemed like I could only load 24 rounds (may need to let the springs settle in). Once it was loaded, it ran like a top with absolutely no stoppages. Much more reliable than using the Black Dog mags. Bolt hold back works great. Easier to load since you can pull the knobs to compress the spring. This is a great product, and allows the S&W mags which do seem better (more reliable, easier to load). Super happy. Will never go back to running without the Better-mag.

I replaced my other Bolt Hold Open device and magazines that go with my rimfire conversion with this Boonie Packer adapter and S&W magazines. Works much better and the magazines are much easier to load. I'm having so much fun I may have to build a dedicated .22 rimfire upper.