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Alliance Hobby 36 S ARCH AVE UNIT 2283
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Alliance Hobby Flat Man's Pack
All My Pumper Performance Mods for Crosman 1322 1377 2289 P1322 P1377

The Flat Man's Pack contains Pumper's Pack and the Flat Top Valve Kit.

MAY 2021 UPDATE: The piston now features two o-rings for better compression. Looks a lot more professional, too.

MAY 2021 UPDATE x2: A solid brass piston is now available. It's fancier. It's heavier. It's bling that only you know is inside...?

Brass pistons are now available!

Older single o-ring style.

Flat Man's Pack

Flat Man's Brass Piston Pack