AR15 light primer strikes

[pwoller]

I have an ar that is experiencing occasional light primer strikes leading to no boom. Ive chected the springs and they are all correct is thetre a place around Indianapolis that can trouble shoot this issue for me? I'm on the Eastside.

Thanks

 

[Bigtanker]

Have you cleaned out your bolt? Also, what ammo are you using? Is it one brand or several brands the light strikes happen?

 

[Bennettjh]

I had that problem when I had too much oil in the bolt around the firing pin.

US Defense Solutions is a good AR place. They're on 37 and County Line.

 

[pwoller]

Have you cleaned out your bolt? Also, what ammo are you using? Is it one brand or several brands the light strikes happen?

Its multiple factory ammos. Bolts clean.

 

[Bigtanker]

How old is the rifle? What brand of upper/lower? Any mods or non-factory parts?

 

[pwoller]

Its spikes billet upper and lower , new upper 2 year old lower. The only thing I did was move around buffers and buffer springs from an ar15 450 bushmaster. I might have mixed them up at some point.

 

[croy]

Could be wore out trigger springs. I'd put a new set in and see if that solves it.

 

[halfmileharry]

Was it running properly BEFORE you switched around stuff?
How many rounds has been run through the two yr old lower?
How many rounds have you run with the NEW Upper and OLD lower together before this happened.
I wouldn't think buffer spring or buffer would cause light strikes.
My guess without hands on would be in the springs or trigger group given the info you've shared with us.
Firing pin in good shape?
If it was mine the first thing I'd do is pull the bolt down and make sure the thing is very clean and no debris in the pin. Be sure to lightly oil and wipe it off. Measure the firing pin. It might be getting worn down.
Trigger springs are cheap. Replace them. I got a lower parts kit about 2 years ago and the trigger springs went south pretty quick. I rebuilt it with better parts.
IF you look closely you can see the difference in some of the kits as far as quality.
Make sure everything is clean. Lint, cat hair, etc... Clean everything. Pull the trigger group apart. Grease and oil harden.
IF this is steel cased ammo step on the other foot.

 

[1mil-high]

What trigger do you have in it? Any trigger with lighter springs can cause light primer strikes. Also make sure that the hammer spring is on correctly. It is a common mistake to put it on backwards which will cause it to wear out quickly after working for a while usually.

Also, make sure that there is only oil on the outside of the bolt and the bolt carrier. Any easy way to check that would be to try a different bolt in the gun.

 

[Wild Deuce]

*

 

[rvb]

Ive chected the springs and they are all correct

Legs of hammer spring correctly on top of trigger pin? or under?

-rvb

 

[pwoller]

They both have the enhanced spikes trigger in them. The spring was in right. I never hada a problem with the trident 450 upper on the spikes lower. Didn't start getting the light primer strikes until I put the JM barrel and bolt on to the spikes upper on the spikes lower.

 

[bwframe]

Lot smarter operators on here than me. I'm stuck using the KISS method.

Have you tried a different (known working) BCG? I've seen this practice "solve" issues at the range.

 

[rvb]

They both have the enhanced spikes trigger in them. The spring was in right. I never hada a problem with the trident 450 upper on the spikes lower. Didn't start getting the light primer strikes until I put the JM barrel and bolt on to the spikes upper on the spikes lower.

I don't know anything about .450s. any special parts in the fire control group, like special hammers?
did you verify the bolt is cam'ing all the way over / carrier fully forward?
measure the FP and FP protrusion.
you mention new barrel... potential for way excessive headspace? (maybe try BCG in another rifle)
have another BCG you can swap in? I'd work out... try different FP, then bolt, then carrier, then whole assembly.
disassemble / clean BCG, maybe debris blocking FP and/or cam.

just ideas off the cuff...

ps. w/o reading back through the thread... make sure you try a couple brands of decent factory ammo,

-rvb

 

[seedubs1]

1) Try a new BCG. Verify if issue is still there. If issue is still present, proceed to step 2
2) Replace trigger springs. Verify if issue is still there. If issue is still present, proceed to step 3
3) Replace trigger group. Verify if issue is still there.

This is considering you've already taken care of the easy stuff.....like cleaning, verifying head space, not using crap components, etc...

 

[pwoller]

Gunsmith said it was the gas block. I guess one of the set screws was loose? Going to go shoot it to see if its running right now.

 

[rvb]

Gunsmith said it was the gas block. I guess one of the set screws was loose? Going to go shoot it to see if its running right now.

It's maybe possible if the gas tube got so out of alignment it kept the carrier from fully going forward (bolt not fully cam'ed). seems unlikely though. good luck
-rvb

 

[halfmileharry]

It's maybe possible if the gas tube got so out of alignment it kept the carrier from fully going forward (bolt not fully cam'ed). seems unlikely though. good luck
-rvb

Scratching my head on this one.

 

[bwframe]

 

[1mil-high]

There is no correlation between the gas block and light primer strikes so long as the BCG is in battery.