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Posted: 1/14/2010 2:00:14 PM EDT
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Posting here hoping someone else has experienced this and possibly has a solution...
I run a CMMG 10.3" upper on my registered s&w m&p lower, but still own the original M&P upper. Before I purchased my cmmg upper, I bought a ciener .22 conversion bolt that ran flawlessly in my original 16" upper. Well, when I got my cmmg shorty upper, I dropped the .22 kit in it to take to the inddor range for fun. It fit in snug, but still went in. It worked great at the range and was a lot of fun. Afterwards, I went to get the .22 conversion out of my cmmg upper and it wouldn't budge, at all. So I tried the dowel rod down the barrel trick, progressively. Hitting the dowl rod harder and harder, until the dowel rod broke, and nothing else budged. I then tried this with an aluminum cleaning rod with the same results, and no budging. So, at this point I am on the edge of freaking out and take the whole expensive mess to work to ponder a solution with my guys. This is where my balls started shrinking up... we tied hitting the conversion kit out with a big flat head screw driver pounded on with a mini-sledge. Nothing budged ( or broke thankfully)! We then packed the upper reciever with dry ice and tried the screw driver and mini-sledge again. With effort, the cierner kit came out, and was slightly damaged. I was able to fix the minor damage to the .22 kit, and it still installs in, runs flalwessly in, and remvoes easily from the 16" upper. It still gets stuck hard in the cmmg upper (only tried it once didn't go all the way in cause it didn't want to come out). In all cases, the .22 conversion was clean and the rifles were clean, and chambers were clean. Its been tried with various ammounts of oil on the .22 kit too. Aight, for give any typos, as I am doing this on my cell phone. Anybody have any ideas for me? I would really love to run the .22 kit in my shorty upper. It was hell of a lot of fun. |
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Quoted:
You might shave the outside edges of the rail on whichever side is rubbing, or both. Can't be more than a few thousandths. Or deepen the notcher on the front a bit. Sounds like the upper isn't concentric, or is undersized. +1 I'd modify the rails before doing anything on the chamber adapter itself. |
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