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Light primer strike

Chappy-Hoyt

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Input appreciated. I have an FN G1. Beautiful gun in really nice shape. Took it out to shoot it for the 1st time a week ago. It fires the first round just fine and then a FTF light primer strike. But,... in full auto there is not problem. 20 round mags on full auto work great,.... switch to semi and one shot them FTF light primer strike.

So why would it have light primer strikes in semi but work just fine in full auto?

Any ideas?

Thanks,

Chappy
 

W.E.G.

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I'm going ot assume you have an actual full-auto gun, and not just a semi where you are firing with the selector in the full-auto position.

Maybe somebody more familiar wih full-auto builds can chime in.

But it sounds like you aren't in FULL BATTERY when firing in semi-auto mode.

Perhaps some fuckery with the auto-sear preventing the bolt from going into full battery.

If you are shooting a semi-auto-only gun, I still say you aren't in FULL BATTERY on the misfires/light-strikes.
Likely cause of failure to go to FULL BATTERY is locking shoulder is too large.
 

adam762

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You didn’t say, but I’m assuming you mean in semi it fires one round then the hammer won’t reset, leaving a light strike on the primer?

If it were not in battery, the firing pin would not be exposed enough for the hammer to strike it to ignite the primer. If it were not in battery, the sear trip leg on the bolt carrier would not strike the sear releasing the hammer. Those two events are happening in full auto clearly. So it goes into battery just fine. What’s happening here is that in full auto, the standard sear, nestled in the middle of the trigger, is pushed out of the way, and does not factor into restraining the hammer at all. The hammer is restrained entirely by the auto sear, and released by the auto sear. In semi auto, the sear in the middle of the trigger is what restrains the hammer until you pull the trigger again. You simply have worn fire control parts. If you took that lower receiver off this rifle, and put it on any other rifle, you would have the same experience in semi. The hammer is following the bolt carrier home, which leaves it with just enough energy to put a light dimple on the primer once the firing pin head pokes through the back of the carrier.
 

NK2000

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Could also be that this particular round had a very hard primer. Was the primer strike a significant dimple? You could compare it with other rounds that were successful. You did not mention if the situation happened only once or keeps repeating.
 

ActionYobbo

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Timing is out. Tripping the sear too early
You are getting hammer follow
Is the safety sear free to move? Not stuck in the tripped position? Try a different safety sear.
 
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