Crosman mods

by Rob in NC (Login rob3dr)
Airgunhunters message board/moderators

The 1377 is an excellent platform for modding. I have 7 13xx's, all in different configurations.

here are a couple of my latest ones...

1377 Converted to 1322 carbine. Cut down the 24 inch barrel to around 18inches, did some mods, etc... added one of Ralphs stocks to it. Giving me around 620fps in .22 with 14.3gr at 15 pumps. Havent tried more.

Finally got around to scoping the 1377 Carbine with a 4x21 short scope. Still need to do internal mods to it. Got a B51 barrel on it, machined to fit the breech.

Mods... the first gun has an adjustable cone piston, valve machined to fit, various valve mods, custom stock, Crosman breech, 18 inch barrel, 760 barrel band, transfer port mod. Of course, this can get very expensive... but...

Here are some mods you can do to a stock 1377 to increase velocity and accuracy. I wont go into detail on any of these as the information is already out there on exactly how to do this.

valve spring and port. Remove the valve and unscrew it. It will come into two halves. Cut a few of the threads on the one half, chuck the valve stem and shave it down a bit, add a lighter valve spring, open up the transfer port a bit. What you'll have now is a gun that will dump more pumps... you can pump 20 or more times to get more power.
This is a no cost mod. Depending on how much you want to spend, there are some mods that are cheap and very effective.

Steel breech, 2289 barrel. $45 or so. Allows you to easily mount a scope, gives a 14 inch barrel, can now do the icemaker transfer port mod.

Adjustable flat face pistons are available from several folks for as little as $25. Increases efficiency so you dont have to pump as much.

Accuracy mods...

Trigger tweak... install a lighter trigger return spring, polish the sear, add a touch of moly.

Recrown barrel.... various techniques for how to do this.

Plenty of info out there on the 13xx guns. Can go from mild to wild with mods... the 13xx's are like the 'Mr Potato head' of the airgun world.

Posted on Mar 31, 2008, 9:39 AM
from IP address 152.133.7.66

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