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Posted: 6/27/2010 6:50:39 PM EDT
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Was out at the range today and noticed that hammer pin was working it's way out of the lower on the left side....but on the right it appeared to be in proper position. Figured something was up and took it apart...to find that the pin had sheared in half at the center retaining groove. I've put a little over 1,000 22LR rounds through it using a CMMG conversion kit, and I was curious to see if anyone else has had the same problem? Pretty minor since I just insert a new pin and was fixed, but I'd heard that the 22LR bolts are a little hard on the trigger/hammer group.
Thoughts?? |
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I broke mine but didn't notice until I tapped the hammer pin with a punch to remove the FCG. I then went with DPMS anti walk pins. under $4 IIRC. I had well over 2000 rounds of .22 and 300 of 5.56.
It seems blowback actions in general are known for breaking hammer pins on AR15's. Kind of like how I can shoot a .45 or 9mm semi auto pistol all day but shooting a .22 or .380 pistol, the recoil hurts my wrists. Posted Via AR15.Com Mobile |
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Quoted:
what exactly causes the broken pins? would a reduced hammer spring prevent it? Rimfire ammunition primers run from very sensitive to very insensitive, generally insensitive. A reduced power spring on the hammer may give you a lighter trigger break, it may even be easier on the hammer pin, but then again it might give you problems igniting the primer. So long as the bolt, firing pin, and chamber are all within proper specs, a good whack on the primer isn't a bad thing when shooting rimfire. Under the circumstances, I'd go with premium anti-walk pins. And remember, DON'T LET THE HAMMER FALL WITH THE LOWER SEPARATED FROM IT'S UPPER.  You may crack the lower if you don't use a hammer test block.
Ted |
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Quoted:
what exactly causes the broken pins? would a reduced hammer spring prevent it? Blowback conversions (whether .22 or other calibers) are harder on pins. If it's not a life saving gun (i.e. range plinker), then buying a few extra 99 cent pins is the cheapest and easiest option. If you want something a bit stronger, heavy duty/SS/KNS pins would be your best bet. I ran my blowback .22's and 9mm's with reduced power hammer springs for years and never broke any pins. I upgraded my 9's to KNS pins a few years ago just to be cool and still haven't broken any of those. |
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