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Never heard of SKS barrels, can't give you feedback. Modify flat hop is a flat hop... Hence the name... But you'd be better off getting someone to R-hop your gun or get yourself 95% of the way there by installing a bridge hop setup.
As for the gun itself, you should look into redoing the mechbox. Last I saw none of the gears were CNCed, they were all sintered. The polycarbonate piston is crap, as is the piston head and the resultant air seal. The nozzle is also garbage, there isn't an internal O ring. The cylinder head isn't good, but it can be used.
As for FPS, if your air seal is any good you should be able to reach your FPS goals with a M120.
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