Originally Posted by
Hsing-ee
I thought it would be better getting some more turns in there .. but you know this kind of stuff better so I will just go M5.
M4 x 0.5 might be fine. Thread depth is key. If the rail is significantly thicker than the cylinder you are mounting it to, you could consider bolting up from underneath, threads cut in the rail ? Obv you'd need to countersink the bolt heads to avoid fouling the piston skirt.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
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