[garuda7]

Recently bought a CMMG .22lr rimfire conversion kit along with two ten round magazines (one from CMMG the other from Black Dog). Took it to the range and I had a few issues. The CMMG would not lock into my magwell. It would constantly slide out. The Black Dog magazine would lock in place but would only fire one or two rounds before the bullet fed vertically and jammed the bolt group. The guy in the lane next to me saw that I had problems and mentioned that he had the exact same issue with his CMMG rimfire conversion kit. I was wondering if anyone else had this issue and if they had solutions to remedy this. Otherwise I'm out 200 dollars for a hunk of metal.

[Arteel]

Where are you located? If you are local, I can help you tune this thing.

[dchang0]

#1: load one less round into your mags. I had trouble getting my BDM mags to stay in the magwell until I started down-loading them by one round.

#2: check that the BDM mag's feedlips are clean. If the insides are rough or dirty, they will grab the rim of the round as it is feeding and then pull it vertical as the bolt slams shut.

[wkd4496]

I have the same problem with my .22 conversion kit. Doesn't matter if I load 3 or 10 into the magazine. A round will end up stuck in the bolt carrier.





Any light shed on this would help greatly!

[Arteel]

Try trimmin the recoil spring 3 coils at a time.

[wkd4496]

Originally Posted by Arteeel

Try trimmin the recoil spring 3 coils at a time.

So it may be the carrier going forward too fast?

[garuda7]

Originally Posted by Kennycruz

I have the same problem with my .22 conversion kit. Doesn't matter if I load 3 or 10 into the magazine. A round will end up stuck in the bolt carrier.





Any light shed on this would help greatly!

yep, this is the exact problem that I have. called cmmg, but they provided little help.

[big al]

i have no issues with mine, tried three different kinds of ammo and all is well.

[slik556]

My father and I both have the same kit and mine worked fine and his did this same thing as yours did. I took a look at his and he had not lubed his as I did. I put a good shot of clp, the only spray type stuff I had at the time and the problem went away. I think these kits have to run kind of wet. May help you, worth a try..

[bdsmchs]

Get a rounded hammer and lightweight springs.

[wkd4496]

Unfortunately slik I did use a lot of clp and that didn't do the trick. But thanks for the help

[wkd4496]

Originally Posted by bdsmchs

Get a rounded hammer and lightweight springs.

Would my local costa mesa rifle dispensary on harbor carry these items?

[bdsmchs]

Originally Posted by Kennycruz

Would my local costa mesa rifle dispensary on harbor carry these items?

Just the hammer.

You want the JP springs from JP/Midway/Brownells

[slowxturtle]

just ordered the kit with BDM mags. Hope all is well with mine.

[Super Spy]

I have a bone stock mil spec lower, middle of the road 16" upper and when I dropped in a used Ceiner conversion kit it worked great. I have 3 BDM mags, and always fill them to capacity (10) I have yet to have an issue. I did a little ammo research before hand and have been running the American Eagle .22 ammo without any issues. Fairly accurate too.

[Marktonium]

I'm having the same problem with my kit/setup. Used Federal, Remington, CCI Minimag all high velocity rounds in varying magazines. Ran it dry, and drenched, cleaned several times.

CMMG sent me a replacement kit.

I'm still having the same problem with my kit/setup.

The guys at the "costa mesa rifle dispensary on harbor" are helping me figure out the problem, I gave them both kits to troubleshoot. They had some luck running it wet, and they have contacted CMMG for a solution as well.

Regardless, the other reviews I've seen for the CMMG kit were near perfect. I'm not the type to bash a company for a defect in their product, especially when they have excellent customer services to remedy any inconsistencies.

I don't see any reason to settle for less. Has the OP had any luck with any of the recommendations? Someone mentioned trimming the recoil spring by three rungs at a time. I'm up for suggestions, but curious how that would work (honestly asking, not trying to criticize)?

I've also searched other threads on ARFcom and others, nobody seems to have a solution.

[Jicko]

I currently have both Spike's and CMMG's. My CMMG's works better than my Spike's originally, until I tuned the Spike's using my CMMG as a blue print. Now both of them are running quite flawlessly.

So, if you are looking for tuning tips, try to also check out Spike's industry forum on arfcom. They are identical designs.

OP, have you tried trimming the recoil spring? A lot of people have to do that with Spike's, to the point that they supply an additional spring with their kit.

Trimming the spring generally solves a lot of the feeding issues.

I have seen some "mod" to slightly deblur the chamber and feed ramp etc.

[bdsmchs]

Originally Posted by Jicko

OP, have you tried trimming the recoil spring? A lot of people have to do that with Spike's, to the point that they supply an additional spring with their kit.

Trimming the spring generally solves a lot of the feeding issues.

Swap the hammer spring with a JP lightweight spring before trimming the recoil spring.

[Arteel]

To the OP, you probably have to create a smooth lip on the chamber. On my CMMG the bullet kept getting caught on the chamber which created feeding issues and bent bullets. After taking a dremel to the chamber, 80% of the issues went away. I noticed the Spikes kit already has the chamber deburred so if you know anyone with the spikes conv. you'll see what I'm talking about.