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Old 03-26-2013, 11:05 PM   #1 (permalink)
Join Date: Jul 2006
Location: Czech Republic (middle Europe)

Recommendet Sterling bolt modifications

Up is stock Sterling bolt, down is after modification:

Mods are:
- screw velocity adjuster trough gasflow restriction
- additional guiding o-ring
- small o-ring working like shock absorber of the bolt while closing

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Old 03-27-2013, 12:06 AM   #2 (permalink)
Ole' Papa Pump
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Join Date: Oct 2012
Location: Mentor, Ohio

I did this to my stock Sterling bolt (adjustable from the front) and to my Venturi Sterling bolt (adjustable from the rear). I now regret doing it back in the 90's because with a Regulator on my gun I see it was totally unnecessary.

just my .02

Started with a Splatmaster, moved onto a Nelspot 007, then came the Autocockers, then a STERLING Pump, next was a Bob Long defiant then a PM7. As of now I have 8 Sterling Pumps, 1 Phantom for SC, a CCM SS-25, a PGP and a Sovereign 3.

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