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All Springer/NP/PCP Air Gun Discussion General > Vintage Air Gun Gate

Crosman 1400 reseal

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Tack Driver 10:
Picked up a 1400 off Ebay for a decent price.
Missing sights and has a crack in the stock on RH side.
The gun is in good shape otherwise in need of a reseal.

Want to keep this close to stock so just some minor mods:

Opened the exhaust port on the valve from .125" to .150".
Counter bored the barrel .100" deep to accept .150" Delrin transfer port.
Flat top 70 duro poly O-ring piston and valve.
Need to make a pivot pin to replace the temp brass pin.

Should get to chrony it soon.

Wayne52:
Nice ole Crosman !!!

cobalt327:
That's a killer piston there. Very nice work.

Tack Driver 10:

--- Quote from: cobalt327 on December 12, 2018, 03:20:26 PM ---That's a killer piston there. Very nice work.

--- End quote ---

Thanks, the brass FT piston head is screwed on with 5/16"x24 threads and machined true.
The holes drilled in the nut and piston are for adjusting the piston in the gun.

Tack Driver 10:
Ran the gun over the chrony:
14.3 grain CPHPs

05 pumps=563 FPS  10.06 FPE
07 pumps=625 FPS  12.40 FPE
10 pumps=712 FPS  16.09 FPE

Decent power considering the 70 duro o-rings.
I'll run it again after the replacement pivot bolt gets installed.
The 3/16" temp brass pin bends robbing power.

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