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Discussion Starter #1
Just got my FS2000, pretty neat rig, I'll get a pic of it with the Leupold/Larue setup up soon.

I'm getting light primer strikes without enough juice to ignite the mil surplus m193 Malaysian. Now, I know this ammo is old but I've never had the FIRST problem like this before with AR15s, a Mini14 or a Savage bolt action.

I gave the FS2000 a light cleaning before firing but didn't pull the firing pin, could oil there an issue? In my experience it takes some serious oil and LOW temps for this to be an issue with other weapons... And it's about 95F here! Also, this is the first military derived design with a spring on the firing pin I've seen, is this an original feature or 'attorney engineering' to prevent slam-fires when some moron runs varmint handloads through a semi!?!?

Or is milspec ammo the problem, this could be a serious issue for me, I know surplus 5.56 is hard to get these days but it's been around before and will be again, a straight diet of commercial ammo will get expensive...

If this is 'just the way it is' then what 'shootin' ammo is the best choice, Prvi, Wolf (I know, I know) or others?

Thanks for your attention.
 

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Any ammo should be fine really. i fired over 7000 rounds through mine and i never had an AD/OOB shot

but from your own research you might want to stick to milsurp just to be safe
 

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The way I understand it,

The firing pin spring is unique to the FS2000. The Mil/LEO F2000 does not have the firing pin spring. A while back, when the FS was first released, it was shipped with the military spec. F2000 firing pin (which is heavier) Some people were running into slam-fire issues with some commercial ammo with soft primers.

As a result, FNH-USA recalled the group of FS2Ks that had the military firing pins, and retro-fitted them with a lighter mass firing pin and the rebound spring we have today.

Now, some people are having light primer strikes with some military spec. ammo.

Not that I'm recommending anything that could cause warranty issues or anything...

BUT, it's been reported by some FS owners that the carbine runs just fine with most any ammo, provided:

a) a couple coils removed from the rebound spring.

b) no spring at all. (due to the fact that the firing pin has less mass than the original military firing pin.)

Hopefully that sheds some light on the issue. :wink:
 

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Mine was having problems detonating surplus ammo with 100% reliability.

I removed the captive spring and it now detonates the same ammo 100% and that was thousands of rounds ago.
 

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Discussion Starter #5
Yup, 'forgot' to replace the firing pin spring and that old 5.56 runs just fine through it. :? Shot some Winchester 64gr soft point .223 as well and had no problems... I suspect it would take a really sensitive primer to be set off by this firing pin's inertia!
 

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My FS2000 that blew "out of battery" up had several light strikes before KB. Be careful. They will not replace your gun if it blows up. I only had a hundred or so rounds through mine.
Blair~
 

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FN packs their rifles with a "storage lubricant" that needs to be completely removed & replaced w/CLP or other approved lubricant before firing or you risk malfunctions.
Tomac
 

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Discussion Starter #8
Hmslr, my light strikes were with the spring in place in a brand new rifle firing well stored but old bright and shiny factory packaged military ammo. I don't think light strikes had anything to do with your experience, it sounds as though you had an overcharged round in your 'mixed bag' or, more likely, the weapon fired out of battery somehow. Now THAT'S worrying... I can't imagine how it would've fired completely unlocked, ALMOST completely locked is another matter since it's basically a Stoner bolt/breech. But ARs don't seem to blow up a lot either, even full of crap. They may not go fully into battery and cause you all kinds of grief, especially if you are using the weapon professionally, but seldom KB.

Tomac, I cleaned w/ solvent and then lubed sparingly with LSA without drenching the firing pin. I think it's the spring and my dwindling mil-surp ammo supply. It ran great this afternoon on the old M193, not even a failure to feed like during the first few mags. But soon I'll be on PRVI and wil probably put the spring back on...
 

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AR's don't have a firing pin spring.. the firing pin is free floating.... anytime you add resistance, you add a chance of failure. My FS2000 fires like a champ... no problems... I suggest, as others have, clean every stinking inch of the rifle first, apply proper lubricant, and try again.

Zhur
 

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Discussion Starter #10
That's right, ARs don't have the spring, neither do AKs, M1/14, etc, the list goes on and on. The spring is the very resistance you speak of and a crutch to prevent slamfires with seriously soft primer ammo. I suspect FN could've addressed the issue with just the low mass firing-pin, much like the AR.

But all is well now w/o spring, loaded to the gills with Hornady 77gr and ready to roll...
 
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