well like i said in the post above, there is no compression issue, the pistol stops and doesnt move forward if i plug the end of the barrel with my thumb. the ports on these cylinders are fairly large, easily 1/4 inch diameter, and 1/2 long. i also checked to make sure the piston sides were not scraping the sides of the gearbox. with no spring the piston slides freely.
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Weapons Technician / Gunsmith
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