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Old September 30, 2012, 09:10 PM   #1
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Ammo for FN-57

Today I purchased Winchester 5.56mm ammo. Won't have gun till Tues. Gun is fn-57 and is made for 5.7 X 28 mm. ammo. I know the velocity of the winchester ammo is 300 fps faster. Will this ammo even fully insert into this gun and would this be safe to use. If not could another barrel be made to install in this gun?

Last edited by scyscraper; September 30, 2012 at 09:22 PM.
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Old September 30, 2012, 09:28 PM   #2
B. Lahey
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5.56 and 5.7 are not the same thing. It will be obvious to you when you see your newly purchased 5.56 ammo next to the pistol, it's just too big to work.

Now you have to buy an AR to use up that ammo. It's the only option that maks sense.
"A human being is primarily a bag for putting food into; the other functions and faculties may be more godlike, but in point of time they come afterwards."
-George Orwell
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Old September 30, 2012, 10:01 PM   #3
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5.7x28 and 5.56x45 NATO are two completely different cartridges. 5.7x28 is a handgun cartridge primarily found in the FN FiveSeven pistol, P90 Submachine gun, and PS90 semi-auto carbine.

5.56x45, on the other hand, is a rifle cartridge and is usually found in guns like the M16/AR-15 series of rifles, HK-33, FAMAS, L85A1, and Galil.

A 5.56x45 cartridge is unlikely to even fit in the magazine, much less chamber or fire, in your pistol. The only large company currently making 5.7x28 ammunition is FN though there are a few smaller boutique makers like Elite Ammunition that offer it.

Not to be condescending or preachy, but you should really be more careful when buying ammunition. You're really quite lucky in this case that all you're out is the cost of ammunition that you cannot use (unless of course you buy another gun or trade the ammo for the correct cartridge). There are, however, firearms which can chamber and fire the wrong ammunition with potentially dangerous results. The general rule of thumb is to fire only the caliber which is marked on the firearm though there are a few exceptions such as .357 Magnum and .44 Magnum revolvers which can safely fire .38 Special and .44 Special ammunition respectively. If you have doubts, most firearm manuals are fairly specific about what type of ammunition should be used. The thought that "it fits OK so it must be alright to shoot" is a very dangerous assumption.
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Old September 30, 2012, 10:39 PM   #4
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I understand the commercial ammo for that gun is very expensive and consequently some are reloading for it.

There was one guy at our range who did that and really did not pay attention to what he was doing.

The gun blew up and not only injured him but a man in the lane next to him as well as a friend of mine who got hit with a piece of shrapnel.

Word to the wise: Use factory ammunition specifically for your caliber weapon.

You are going to get in trouble if you don't.

Chances are it will hurt.

Carpe Cerveza
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Old October 2, 2012, 11:22 PM   #5
chris in va
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I really hope this is just a poor attempt at a joke, because someone is seriously feeding him a line of bad information.
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