.22 conversion for ar-15

[Circuits]

If you're switching between .22 and .223 in the same upper, the recommended procedure is to fire a few rounds of .223 for every couple hundred rounds of .22 to blow the gas tube clean of any lead or carbon buildup, and let the jacketed rounds scour most of any lead deposits out of the rifling. Before I switched to a dedicated .22 upper (which has no gas port), I'd fire about five rounds for every brick/milk carton of .22.

Some buildup/blockage does occur, since it would often turn out that the first round or two of .223 wouldn't cycle the rifle at first after shooting a lot of .22. I'd single-load and fire each round of .223 with an empty magazine inserted, and consider it "blown clean" when the bolt locked back.

[MichiganMilitia]

Okay, so there's no known permanent damage or undue wear and tear on the 5.56/.223 upper?

[King]

I bought the cmmg .22 kit and had it out for the first time today. I shot 300 rounds of winchester wildcat. I had 3 FTF and 1 FTE. The kit doesnt like to extract unfired rounds so if you have a dud, it can be a pain to get it out. I am overall pleased with the kit. Its only .22 but it still puts a smile on my face. Definitely worth the investment imo. Only 3 FTF with cheap ammo didnt bother me.

[mutt]

The kit doesnt like to extract unfired rounds so if you have a dud, it can be a pain to get it out.

My Spike's kit (dedicated and conversion) had the same problem. I found replacing the extractor spring with a stronger spring (u can get them from blackdog machine) and slightly profiling the extractor claw to make contact with more of the shell rim really helped. You won't get 100% unfired extraction, but you'll get 90-95%.

[Circuits]

Yeah. The wonderful world of bulk 22LR... where we'd like every round to go "bang" but that often turns out not to be the case.

[WillysWagon]

So what about the little sting it gives you on the cheek when you plink, is it powder residue or what ?? Happens to me using the .22lr conversion on any AR15 I use it in. Does a dedicated .22lr upper do the same thing ?

[Circuits]

A dedicated upper has no gas tube or gas port, so no sting.

You can cut down on it with a gasbuster charging handle.

[WillysWagon]

A dedicated upper has no gas tube or gas port, so no sting.

Thanks Circuits, time for a dedicated .22lr upper then

[rl45acp]

I just got a chance to try out my new CMMG conversion today. I got it from Bowers Tactical last week. Only got to shoot 75 rounds thru it. I had however been firing some Agula powderless rounds thru it. Kind of a PIA as they don't eject, and I had to use a cleaning rod to pop out each case. But it was fun being able to shoot the AR in the living room.
First mag was a little touch and go, had a couple of FTC (failure to cock, new term i guess). Second mag, one misfeed. Third mag, no problems what-so-ever while rapid fire. Havent cleaned the rifle yet.
Groups sucked, but I was using a crappy NcStar hallo type sight as I have no Iron sights for my rifle.

All and all, Funner then hell! And cheap too.

[Hoosier]

I just read somewhere that Ceinner (spelling?) has horrible customer service. Sorry I can't provide a source I didn't save the link, and I haven't dealt with them so it's hear-say evidence, for what it's worth.

I also saw CMMG now offers a stainless conversion, so I think that's what I'm looking for.

H.