Slr stock barrel length (not cqb)

hi guys, just wondering what the stock inner barrel length is for the slr (not the cqb),
and also does it use any specific piston head or nozzle? or can if it says fits j9 then should also fit slr?

I’m holding it in my hand, it’s 30cm. Swear some places said different but yeah, I’m looking at it right now. It’s also got the indent in one end for the t piece.

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