I was suspecting that. I bought a complete upper. It came with bcg with "enhanced firing pin". Small tip. Cratered primers happened midway to max load. I have been searching for firing pin with thicker tip since, but mostly to no avail. I bought a bolt with tighter firing pin hole from a buddy and that solved the problem.Marketing /advertising
In other words--if it ain't broke fix it? It might be worth considering the manufacturer has some experience with these things.I was suspecting that. I bought a complete upper. It came with bcg with "enhanced firing pin". Small tip. Cratered primers happened midway to max load. I have been searching for firing pin with thicker tip since, but mostly to no avail. I bought a bolt with tighter firing pin hole from a buddy and that solved the problem.
I got lucky yesterday. Friend told me about Fulton's FP with 0.078" tip. It is the thickest I have heard. Cheap. Will order a few.
-TL
Since the grand inquisitor of the Armalite inquisition is back in our presence--I will refer to the larger AR platform as 308 xxx (don't want to upset the DPMS crowd, either).
He didn't say he had an Armalite--did he? And yes, you are nitpicking.I'm not upset and the attitude is uncalled for. The Armalite AR-10 has a physically different bolt and firing pin. The parts are not interchangeable.
I'm not nit picking terminology.
He didn't say he had an Armalite--did he? And yes, you are nitpicking.
So "pressure" as in "high-pressure firing pin" refers to the gun's chamber / port pressure? That's what I first thought. But what does it have to do with the tip size? If I drop in a regular firing pin, it will screw up the action cycling? Can't wrap my head around this one.The firing pin "exerts force" only because it is carried along by the carrier--or is hit by the hammer. High pressure does not refer to anything the pin is doing; rather, it's referring to higher pressures internal to the barrel and chamber which in turn affect functions such as cycling, dwell-time, when the bolt unlocks etc. The cartridge you're dealing with naturally will have variable functioning as your pressures vary depending on the charge weights--energy yielded. Most of this will be "governed" by your gas system.
I did say ar-10 in op, even though I meant dpms, as I didn't realize the parts were different. Thanks for the info.He said he had an AR-10. Only Armalite makes an AR-10. If that means something different to you, the problem is in your thinking.
The DPMS is built like the AR-15 . Pull the retaining pin out of the bolt and drop the firing pin out.
The AR-10 ,pull the retaining pin,drop the firing pin out,but looky there! A firing pin rebound spring comes out! A whole 'nuther part!
I'd guess its there to lessen the firing pin impact on primers when the bolt slams shut.
And,to make up for the spring length,the shoulder positions are machined to a different location on the Armalite firing pin and the bolt has a bore for the spring.
That information might matter to a Gentleman who said he was considering an AR-10 firing pin.
Perhaps because I had to explain it to you, you were not aware.
FWIW,I say "45 Long Colt" but IMO,its OK.
Have a nice evening!
Just google it--you'll come up with lots of hits on various forums that will explain it to you. Best of all--call your manufacturer--there's probably a very good reason they elected to go this route rather than try to pull the wool over your eyes with marketing hype.So "pressure" as in "high-pressure firing pin" refers to the gun's chamber / port pressure? That's what I first thought. But what does it have to do with the tip size? If I drop in a regular firing pin, it will screw up the action cycling? Can't wrap my head around this one.