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Post #2... Modifaction #1 - Sear Spring Adjuster "Tuning" Mod

11/2/2013

5 Comments

 
Here we have the Crosman Sear Spring Adjuster.  It is comprised of three parts (the spring, the base and the adjuster).  This upgraded sear spring comes on the 2300S and the Crosman Custom Shop 2300KT and 2400 KT pistols and carbines.
Picture
This upgrade will also fit any of the trigger frames of the 22xx and 13xx familes as well as the Backpacker.

These guns with the stock sear spring will have a trigger pull in the 3.5 to 4.0 lb. range.

Add this upgrade with the adjuster all the way down and you will immediately have a trigger pull in the 2.5 to 3.0 lb. range.  Getting better, huh?  But that's all there is?  The adjuster is all the way down and you can't relax the spring any further !?  Nah!

So lets mod the mod, then... shall we? 

Cut about two loops off of the spring on one end only.  If you can't count loops, then just make it about 1/4" inch shorter.  Re-install the spring with the freshly cut end of the spring DOWN.  With the adjuster lowered all the way, cock the gun and dry fire it.  If it will fire, then take the spring off and cut another loop off.  What?  Yes, we do not want the gun to release the hammer with the adjuster all the way down.  Fast forward to you having the spring in with the adjuster down and the gun will not release the hammer.  GOOD!

NOW... adjust the adjuster up while testing every 1/4 turn until it WILL release the hammer (dry fire).  Dry fire over and over to make sure it will release the hammer every time.  Adjust up in 1/4 turns until it does release the hammer many times in a row.  

Congratulations!  You now have a trigger pull in the 1.5 to 2.0 lb. range.  Feels really good, huh?  You are now about 1/2 the trigger pull of the stock trigger spring... and you have doubled the affect of the adjustable sear spring from approx. 1 pound of pull reduction to approximately 2 pounds of pull.  

If that is too light for you, there is still more upward adjustment to go higher with spring tension and trigger pull.  So, there is no harm done and we have not lost anything at all (except I am positive you just voided your sear spring adjuster warranty).  Pity that. ;)

Oh, almost forgot: If you have a CCS (Crosman Custom Shop) trigger frame that has the adjustable trigger stop, now is the time to set it as close to the the trigger as possible without preventing repetitive firing.  It takes the "slop" out of the trigger travel past the point of firing.  

Less unnecessary movement = better grouping / accuracy.  A repeatably predictable trigger pull that you can "get used to" and count on = better grouping / accuracy.

Next time we'll talk a bit about the finer points of cleaning and polishing and de-burring (Oh MY!).

Until next time... Have fun shooting!

5 Comments
[email protected]
11/24/2015 01:25:41 am

Love the input! Just getting back into air guns, ordered a custom shop 2240. Should get here in a couple weeks.

Reply
Timothy J. Schiavo Sr.
5/26/2016 07:10:45 pm

Mr. Grimes , I am truly enjoying your blog . I am learning a great deal from you . Thank you for sharing your knowledge. I will take your advice concerning a break down ....cleaning / polish and lube when my 1322 gets here from Crosman . The hell with the warranty ... The gun is coming out of the custom shop with the long steel breech , I don't know if the updated sear spring adjuster will be included , we`ll see ... 4 - 5 lbs on trigger pull is too high for sure so I may be contacting you for parts . Tim

Reply
Joshua Purple
5/28/2016 12:15:27 pm

Loved reading all of the blog's and all the provided information for these crosman pistols! I read this blog about the crosman adjustable sear and followed your (easy) directions and with'n minutes the 1322 was a different gun! The stock trigger pull is very heavy and stiff and does not help you shoot accurately one bit, but after installing this sear adjuster, and with help from all the Alchemy parts the trigger is a dream to shoot, I have the stainless (roller) trigger matched with the (right size) stainless sear, and this adjustable sear and man it is light,smooth and crisp! Thanks again to David and Alchemy for all the parts and (blog's) information and I will be back on the next build :)

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Ontario Places link
2/1/2021 10:48:58 am

Thaank you for being you

Reply
Massachusetts Flat Roofing link
1/9/2023 03:49:10 pm

Thhis was a lovely blog post

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    Author: 
    David Grimes

    A serious airgun enthusiast with a particular fondness of Crosman pistols, I learn something almost every day.  


    I am not an overall expert or guru, but I will share some things from time to time that maybe some of you will find interesting.  


    There are often many ways to accomplish an objective. I do not pretend to either know them all or imply that I am always right. 


    Therefore, I reserve the right to be wrong from time to time.  ;) 

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