Factory SBR barrel thread pitch

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
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swissguy
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Factory SBR barrel thread pitch

Post by swissguy » 22 Jun 2022, 03:05

Molded on stock, left side:
Fabrique Nationale Herstal BELGIUM
Below that:
FN
Columbia, SC

Came in a brown cardboard box. It's a factory SBR. Picatinny top rail.

I took it home from the shop today. I had bought a CMMG barrel thread adapter from M12x1LH to 1/2-28. But, to my surprise, the barrel is not threaded LH. Seems to be M12x1mm RH.. you just can't trust the internet any more ;)
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Buffman
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Re: Factory SBR barrel thread pitch

Post by Buffman » 22 Jun 2022, 10:21

I'm unaware of them making any changes to the barrel threads.?
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panzermk2
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Re: Factory SBR barrel thread pitch

Post by panzermk2 » 25 Jun 2022, 08:25

There is no such thing as a factory SBR PS90 at all ever.


You got suckered into buying something someone screwed with already.

Sorry man, but I think you figured that out already. Hopefully they re installed every correctly.
Jay Wolf
Pr. Elite Ammunition
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swissguy
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Re: Factory SBR barrel thread pitch

Post by swissguy » 26 Jun 2022, 09:49

Thank you for this information. I will have a word with the shop owner I bought it from.
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