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Right now Im machining the bold handle to interface right with a Gaurder Reinforced Stainless steel cylinder. I dont know if the cylinder is designed for 1 big guide stop, or 2 smaller ones, but Im drilling the handle to take 2 5mm brass rods as the guides.

Im assuming it is in fact made for 2 smaller ones since one of the detent pins sits between were I need to put the stops. Keep in mind I have no idea what bolt handle the cylinder was designed for, It was the only stainless steel non-crimped cylinder I could find.

So far ive taken the detent pins/springs out of and ground down the guide stub/stops (No idea what else to call them), had to hog out that triangular shaped endpiece to accept an M5 5x 25 mm hex head machine screw and crush washer, and drill a new hole to reposition a detent pin, 1 pin being useless and removed.
 

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Bump: Sorry to double post but I got my bolt mods finished and back together with the S190 spring, now my question is, and I realize it probably needs to be modified to work, does anyone have any idea what Hop-up chamber the M99 uses?
 
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