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3/30/2014 8:16:59 PM EDT
After the first time I went out to shoot my new 6.8 I noticed that the firing pin was a little sticky just as it went through the hole in the bolt. It would not jam in but it had enough resistance to hold it and would not just drop out. After a thorough cleaning it still stuck so I went ahead and bought a new firing pin which then moved freely in and out of the bolt. Went shooting today and I'll be darned if the new pin is now sticking. I cannot pickup any issues by looking at the spent cases which is factory Hornady 110 Vmax.

This upper was built with all Stag parts, and Stag has already replaced the BC for being out of spec, so could the bolt also be out of spec causing the pin to stick after firing? The gun itself shoots fantastic. The only issue I ever had with it was being over gassed which was solved with an adjustable gas block.
3/31/2014 3:49:45 AM EDT
[#1]
Sounds like you could have a rough surface or a burr on the bolt.  Is the firing pin damaged at all after firing the rifle?  I'd check the end of the bolt where the firing pin is inserted.  I would still call stag and get a new bolt.
3/31/2014 7:35:50 AM EDT
[#2]
Thanks.

I rolled the firing pin on a flat surface this morning and it is bent, same with the old one. I swapped in a FP from another AR and it is fine. Need to figure out why they are bending.
3/31/2014 1:29:21 PM EDT
[#3]
Hold the bolt up with the firing pin in it and see if the pins head is flush with the back of the bolt.
If not the turned down tip of the firing pin is not long enough and is bottoming out inside the bolt and jamming
3/31/2014 3:36:53 PM EDT
[#4]
The head is definitely flush with the back of the bolt. What I did find is that the cam pin has an extreme amount of play which could account for the firing pin being bent. Will get new cam pin and FP and try'er again.
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