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Try with a single o ring of the correct size. (Two o rings slightly larger jammed in place without space for free movement could cause this problem.) Just a wild guess.

The vulcans without the bleed screw can be degassed like a marauder. Remove the hammer spring adjuster bolt and spring and use a 12x1 mm (check again for correct thread size) bolt of required length to do it. Alternatively you could also place a suitable rod between the spring adjuster (with hex...

Fearnloading, The original leade angle is a bit acute which makes the cocking nasty hard. Check transfer port for burrs. Pass pellet through barrel and check for damage.