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I had this problem when I got my gun back from the firing pin refit. It would not detonate milsurp like XM193 and M855 100%. Maybe one round out of 30 or so would not detonate.

I removed the captive spring from around the firing pin and have since ran about 2000 rounds of various milsurp through the FS2000 without any failures to detonate other than plain dud rounds.

In attempting to cure the FS2000 of slamfiring commercial primers, FN went with both a captive spring and a lighter firing pin. This was overkill and resulted in a gun that would not reliably detonate some milsurp. By simply pulling the captive spring off the firing pin, you will have a firearm that works 100% with all milsurp rounds but will not slamfire.
 

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I shoot almost only milsurp and this gun has become a complete turd for me due to this issue. it's been really demoralizing and i've almost sold the gun more than once and if it hadn't been for that ass hat a V tech it would probably already be gone.

anyway, now that the fine is so light i worry about not running any spring -- anybody tried cutting one down to have a compromise?
 

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Hopeful news!

I fired off an email to Bob Ailes @ FNUSA to find out if Belgium ever sent the permanent firing pin fix at the end of June. The new fix is supposed to correct both the slam-fire w/commercial, and soft-strike w/milsurp ammo problems.
Within hours he replied to let me know they were testing the new fix in guns as he was sending the email. No word on whether we will have to send them back or not, or, when they expect to be done testing and start notifying.
At least it seems we are close to complete resolution.

Jim
 

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good news -- thanks Jim!
 
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