I decided to start a video series about my modifications on a new Crosman 1322. I'll be building this gun up to 12 - 15fpe and keeping it as short as possible. Number of pumps required isn't much of a concern as this gun is intended for hunting. This first video is an introduction to the series and baseline testing on the stock gun. Following videos will include more chrony and group testing to chart the progress of the modifications and will be published as time and budget allow.
Crosman 1322 Modification progression (Updated 9/24/16)
- Thread starter bill_dd97
- Start date
Here's the next installment. Just doing a little work to the stock parts produced surprising results.
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Thanks guys. I've got my next parts on order. Steel breech install is next, then I'm planning on doing my own mods to piston and valve.
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Good luck and have fun on your project.
1: 18" barrel with 4.4" vented muzzle brake covering the first 3" of barrel.
2: Steel breech with custom extended probe and handle, plus 25% bigger transfer port and power hammer spring.
3: Custom vented trigger with blue shoe and softer sear spring.
4: Flat top ported hp valve with lighter inner spring and flat top adjustable pump piston.
And there's probably more mods
that I can't remember right now.Hehehehe
The final result with Crosman premeir domed 14.3gr
5 pumps 470fps
10 pumps 560fps
15 pumps 620fps
20 pumps 655fps
Here's my baby
1: 18" barrel with 4.4" vented muzzle brake covering the first 3" of barrel.
2: Steel breech with custom extended probe and handle, plus 25% bigger transfer port and power hammer spring.
3: Custom vented trigger with blue shoe and softer sear spring.
4: Flat top ported hp valve with lighter inner spring and flat top adjustable pump piston.
And there's probably more mods
that I can't remember right now.HeheheheThe final result with Crosman premeir domed 14.3gr
5 pumps 470fps
10 pumps 560fps
15 pumps 620fps
20 pumps 655fps
Here's my baby
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Part 3 is up.
In this one I installed a steel breech, an extended bolt and solid pivot pin. Chrony tested each step to record any improvement. I also replaced the transfer port with a piece of 1/4in poly tubing with id of 0.17in, to show why the transfer port needs to match the valve and barrel.
In this one I installed a steel breech, an extended bolt and solid pivot pin. Chrony tested each step to record any improvement. I also replaced the transfer port with a piece of 1/4in poly tubing with id of 0.17in, to show why the transfer port needs to match the valve and barrel.
Upvote 0