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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...?

APRIL 2023 UPDATE: Crosman 362 Flat Man's Pack now available.

APRIL 2023 UPDATE x2: Adjustable Pistons now available.

So, the entire kit is the:


Full Kit

Install Video

Brass pistons are now available!

For reference, this is the older single o-ring style.

brass flat valve

Flat Man's Kit
$89.99 - $99.99

Not compatible with the 362, whose kit is here.