I've had a stainless CMMG .22 conversion kit for years now and never really had any issues with it until recently. I noticed the bolt was having a hard time going into battery on all 4 of my ARs. Even after shooting, trying to get the bolt out required me to use a hammer and punch so I knew something was up as it was getting really stuck in the upper. I emailed CMMG support and they sent me a new chamber insert/collar because they think the one I had swelled up and was the reason for it being so tight. The new collar arrived and was easily seated into battery and easy to remove in all my rifles.
Today I went to the range to test the new part and noticed on the first magazine, using (3)black dog 10rd mags w/stainless feed lips and Federal automatch .22lr ammo, that the gun would not cycle properly. I was getting failures to feed, extract, stovepipes, and 2-3rd bursts. I pulled the bolt out, broke it down, inspected it etc...all looked good. Put it back in the gun, and same issue for all 100rds I shot through the rifle. Rifle is a Bushmaster M4 E2S carbine and this same bolt, sans the new collar, has been shot many times without issue. I have also shot many rounds of .223/5.56 with no issue.
I plan to email CMMG support again to see what they say, but what could be the problem here?
Today I went to the range to test the new part and noticed on the first magazine, using (3)black dog 10rd mags w/stainless feed lips and Federal automatch .22lr ammo, that the gun would not cycle properly. I was getting failures to feed, extract, stovepipes, and 2-3rd bursts. I pulled the bolt out, broke it down, inspected it etc...all looked good. Put it back in the gun, and same issue for all 100rds I shot through the rifle. Rifle is a Bushmaster M4 E2S carbine and this same bolt, sans the new collar, has been shot many times without issue. I have also shot many rounds of .223/5.56 with no issue.
I plan to email CMMG support again to see what they say, but what could be the problem here?