Friday, January 29, 2010

ka-POP!

So I mentioned that I fired my CMMG rimfire kit for my AR while I was at CCA, right?

I had a couple of failure-to-feed issues, say four or five in fifty rounds, most likely due to the fact that I neglected to lube the conversion kit before dropping it in the upper, which caused it to be rough as a cob, and the springs that run those things are pretty feeble.

More exciting is the fact that rimfire conversions on the AR are straight blowback rather than locked-breech, and that they will fire when out of battery by a fairly significant amount. With some of today's .22LR ammo running higher chamber pressures than .45ACP +P, stuff can be expelled from the ejection port rather forcefully when this happens.

In my case, a round of Aguila Interceptor fired with the bolt not fully closed. I was fine, the gun and conversion kit were fine, and I was mostly just glad I was shooting right-handed. The kit has since been sprayed with Strike Hold and cycles a lot more smoothly; I'll be shooting it more extensively this weekend.

8 comments:

  1. Sounds like you're leaving something out there, Ma'am. How far did the pieces fly, how big were they, etc.?

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  2. Nothing flew that I could tell. The spent case looked like one of those booties you put on the end of a turkey drumstick, though...

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  3. I've seen the same thing with the Tactical Solutions AR22 upper, and have heard other similar reports on these .22 conversions.

    One thing that seems to help is paying a higher-than-average amount of attention to cleaning the chamber after each range session. Instead of just running a bore snake through it, consider using one of the more traditional brass bristle brushes with a decent amount of elbow grease.

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  4. You didn't mention if the magazine was Ok?

    I had an AR-7 fire out of battery, and the bottom of the mag bowed out.

    I assume you checked yours, but I'm posting just in case.

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  5. I once had a very old .22 semi auto that occasionaly went to full auto and spewed out the entire magazine in the wink of an eye. Really got my attention as I shoot left handed. Got rid of it quick.
    Anyone know of an AR or HK type rifle that a lefty can shoot without gyrations and brass zipping across his face?

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  6. Stag Arms makes a lefty AR.

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