Reply To: The Crosman Powermaster 760…Recapturing my youth !

Forums Springers, Pumpers, C02, & Vintage The Crosman Powermaster 760…Recapturing my youth ! Reply To: The Crosman Powermaster 760…Recapturing my youth !

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GoldenStateAIRGUNer
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Mine has improved considerably since I last posted velocity figures. With BB's. 3 shot averages.

3 pumps 410 fps

5 pumps 500 fps

7 pumps 550 fps

8 pumps 595 fps

10 pumps 635 fps

 

I've noticed the air blast between the breech and bolt on mine. My idea was to use a lathe with a cutter tool designed to produce a groove for an "O" ring. Problem is the groove would have to be very small and deep enough to retain the o-ring. The o-ring itself would have to very small. Say .040" thick with a outside diameter of 3/16" or less.