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I’m thinking of polishing my Gamo barrel with valve lapping compound, Flitz, and or JB bore bright. Should I use a brush or mop? Did your groups improve after polishing? Can I hurt my barrel?

My Trail NP XL does not group well with Premier HP 14.3 grains, but shoots dime size groups at 25 yards with GTO 11.75’s. Could the light pellets exiting the muzzle before the vibrations start? Any ideas why this difference?

Avenge-X will not hold pressure. I add air to my Air Venturi Avenge -X, and by the next morning when I want to shoot, the pressure has dropped from 4,000 psi to 2,000. What o-rings do I need to replace?

Any thoughts on an accurate budget .22 pcp