Hi all.

I am new to air guns and just picked myself up a M4-117 by Crosman.

I live in Canada so I dot the detuned version, 497 FPS IIRC

Does anyone know exactly how Crosman Detuned this air gun?

I also came across a metal flat top piston kit upgrade searching the internet the other day, however, wondering if anyone can tell me if a Canadian source exists for this mod?

can anyone point me in the right direction on these 2 questions?

thanks all.