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Discussion Starter #1
I have several FNS including:
• FNS 9C
• FNS 40C
• FNS 9 (4” barrel)
Does anyone know if the 509 threaded barrels will work on the FNS?
I’m thinking the 509’s compact treaded barrel should work on my FNS 9 compact and the 509 mid-size threaded barrel should work on my FNS 9 4”. But I don’t know for sure.
Has anyone else tried it yet?
 

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Barrel lugs are different, if memory serves. I believe there are also a couple of other differences that would make it unable to work as well.

Does efk still have threaded FNS threaded barrels available? That might be your best bet.
 

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[...]
and the 509 mid-size threaded barrel should work on my FNS 9 4”. But I don’t know for sure.
Has anyone else tried it yet?
The 509 will definitely not fit the FNS non-compact. The 509(/x) barrel lug is a newer design similar to the FNS-C.
 
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