This is for an AR 15 , but relates to any caliber AR .
Had an AR 15 come to me today because of Failure to fire any brand of ammo & as soon as I looked at the rifle , I could see the Hammer pin was out about an 1/8" or so & the Hammer was cocked to one side . I put the pin in all the way & it seemed to lock in place on the pin keeper . Using a primed empty case , it set the primer off , no problem .
I removed the FCG & the Hammer looked like it was OK in the Pin hole , with the wire in the middle that holds the Pin in place , but didn't want to take the chance of it being broken or weak & having this happen again , so I replaced the FCG . Another primed empty case & it fired off the Primer . He was Happy because I put in a Spikes Enhanced trigger group w/Pins , I had sitting around .
Just thought I'd pass it along , because I have heard of the Pin Keeper in the Hammer losing its capability to Keep The Pin in place , but have never seen one do it , not that its 100% certain , this one did , but why take the chance , as said. The owner is not the type to disassemble any more than normal cleaning , so I can rule out someone removing & not assembling correctly .
He took it home & dumped a twenty rounder & all is well .