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Posted: 8/27/2011 12:46:56 PM EDT
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These photos are of a firing pin from a DPMS Dissipator carbine with no more than 225 rounds through it since new, all fresh American factory ammo. There is a dimple in the head of the firing pin that resembles the primer dent in a cartridge. Then, on the underside of the flange of the pin, there is a circular crevice that resembles flame cutting. The hammer/trigger is sn RRA Match Trigger with no other mods in the operating system. The gun has never malfunctioned and operates in a completely normal manner. Fired cases are also normal. There is nothing in the interior of either the upper or lower groups indicating any damage resulting from these anomalies. The bluing is disturbed as normal on the hammer from striking the firing pin, and another of my rifles with the RRA Match Trigger looks the same, but it's firing pin is normal. I honestly don't know if I'm dealing with a problem in the gun or if the firing pin was improperly manufactured. Would anyone care to venture an explanation for this? Any help appreciated very much.
Herre's the dimple 
Here's the crevasse 
Thank you very much for any help. MM |
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Please disregard my post, gents. I have my answer. The dimple and the cut are both results of this firing pin missing the final machining process at the factory. When told this I compared the thickness of the head and flange of this particular firing pin against a brand new one and this one is noticeably thicker to the naked eye. So my bad and thanks anyway.
MM |
I can't see what machining process they would have missed. Its not like they would re-chuck it up in a lathe and take a finish pass. The larger diameter could be from the possibility that it is an M-16 firing pin which has a larger flange than AR-15 firing pin. I may be wrong though.
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