New AR15 poor primer striking issue

v4kerker · Sep 17, 2016

Hi I'm new to the AR15's. I bought a Del-Ton carbine rifle kit. Problem app rears to happen when the rifle gets hot. Some rounds won't fire and sometimes I'll reload the round it'll fire.
I cleaned and lubed the BCG and the same thing happened. I'm shooting American Eagle black and green boxed ammo.
What's the the next steps to preform to resolve this on my own first before going to gun smith/Del-Ton?

WSM · Sep 17, 2016

Borrow some gauges and check headspace. Other than that, I'm at a loss.

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v4kerker · Sep 17, 2016

More pics

Having a hard time loading multiple photos from my iPhone.

v4kerker · Sep 17, 2016

WSM does the head space grow/change as the rifle/breach area gets hot?

WSM · Sep 17, 2016

v4kerker said:
WSM does the head space grow/change as the rifle/breach area gets hot?

No, not to my knowledge.

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WSM · Sep 17, 2016

v4kerker said:
WSM does the head space grow/change as the rifle/breach area gets hot?

How hard are you running the gun and what kind of ammo?

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smokey · Sep 17, 2016

what trigger/springs you have in it?

mopar92 · Sep 17, 2016

Throw up a picture of your lower (the FCG) and the tip of the firing pin. Also check your firing pin potrusion.

WSM · Sep 17, 2016

smokey0118 said:
what trigger/springs you have in it?

Didn't even think of that. Lol

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smokey · Sep 17, 2016

WSM said:
Didn't even think of that. Lol

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I figured it makes sense to get info on what's hitting the firing pin before seeing if it's an out of spec firing pin or something more complicated.

outrider58 · Sep 17, 2016

Correct pin protrusion falls between .028 and .035 for go. Any more or less will be a no-go.

lee2 · Sep 17, 2016

Sounds like your tolerances are changing as the gun heats up. Do you have another bolt assembly to try?

v4kerker · Sep 18, 2016

I'm shooting the American Eagle 55 grain and 62 grain, firing rate was 80-100 rounds in a 30 minute session at Hap Baker.

v4kerker · Sep 18, 2016

Tigger assembly is the one that came with the Del-Ton rifle kit the lower is a BCI.

v4kerker · Sep 18, 2016

WSM said:
Didn't even think of that. Lol

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How do you check to see if the firing pin is out of spec?

v4kerker · Sep 18, 2016

lee2 said:
Sounds like your tolerances are changing as the gun heats up. Do you have another bolt assembly to try?

No Lee2, but I might be able to barrow my neighbors Colt BCG.

v4kerker · Sep 18, 2016

smokey0118 said:
I figured it makes sense to get info on what's hitting the firing pin before seeing if it's an out of spec firing pin or something more complicated.

This is the stock spring and hammer that came with the Del-Ton rifle kit.

v4kerker · Sep 18, 2016

I think I found the possible problem.

Went you tubing for my issue and I think my hammer spring is installed upside down

mopar92 · Sep 18, 2016

v4kerker said:
Went you tubing for my issue and I think my hammer spring is installed upside down

Yeppers, it can also cause it to go full auto. When you tear apart yiur FCG also take out your trigger and make sure the disconnector spring is installed with the fat end facing down.

smokey · Sep 18, 2016

Sweet, looks like an easy answer/easy fix. Enjoy.

New AR15 poor primer striking issue

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