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Trigger systems and firing pins

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Lmbass14:
I have an AR 15 DPMS lower with a Stoner 7.62x39 barrel, bolt and bolt carrier group.  It came with a heavy duty Wolff trigger spring and the trigger pull was in access of 8# (highest my trigger pull gauge went), by a long margin.  It fired every round which is the good news.  The not so good news, is that with that trigger pull, it takes the fun out of it.

So I picked up Timney Trigger and  here are the results per box of 20 all FMJ except where noted.  This is all the different brands of ammo I have.  No problems with brass case.

Herters - 7 fail to fires

TCW (Tula Cartridge Works) - 8 fail to fires

MFS (Russian) - 0 fail to fires

Wolf Military Classic ( Hollow Point) - 13  fail to fires

Wolf Black Box (Hollow Points) - 13 fail to fire

Silver Bear - 5 fail to fire


That wasn't going to work, and thought, Wilson Combat would definitely work since the description says that it will fire all military surplus ammo.  Went to the Bullet Hole and ordered one (the M2 model).   

The install was a piece of cake  all of 30 seconds. It's real short take up before the wall, and a crisp break.  Did ten test pulls and all were 4 lbs.

Went to the range, and went through all the above boxes that wouldn't fire, and the Wilson Combat only fired 1 round of Wolf Black Box.  The rest of them went the dreaded "click".

My Brother suggested a modified firing pin and he just happen to have an extra pin that had .02 removed from the collar (don't know the correct nomenclature) and this is the result:

With Modified firing pin:

Tula - Perfect

Herters - Perfect

Golden Tiger - Perfect

Wolf Military Classic - Perfect

Silver Bear - Didn't use since I knew it would fire.

My question is: Is this normal to have to use a different firing pin along with the trigger group?  I was ASSUMING that the WC trigger would have a strong enough spring to ignite all the ammo.  Yes I know the Russian ammo is notorious on having deep set primers and that is the culprit and all the primers strikes looked normal.

I did contact WC customer support, and they sent me a replacement trigger group, but had the same result, and at this time the engineers "are looking into it".  Yeah right.

Your thoughts are appreciated.

RobertH:
i'll be following this thread....

shooter:
 SO, you have a extra timney trigger?  talk to me about it!


  sounds like the firing pin tip was to short. if adjusting the length a little and it works, I wouldn't worry about it

tstuart34:
Just curious have you tried a different bolt? Maybe it's not the firing pin.

Lmbass14:
shooter, gave the Timney to my Brother. 

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