Hi Power Action Job

[ToddSig]

I posted this question on another forum in a thread on an SA-35 action job. I thought it would be good to post here, and would be interested to hear comments from our residents experts such as Chuck and Bob Reed on this trigger pull reduction technique.

Has anyone tried the Austin Behlert process of flattening the kink at the top of the sear spring. He is not talking about bending the overall shape of the spring, just removing the upper kink to extend the length. I found a post where Austin stated the following which peaked my interest.

"For all you newcomers and some of you elderly smiths, here is a way to lighten the trigger pull on a Bng. I you notice, there is a kink near the end of the sear spring that contacts the sear. All you have to do is heat this little kink and squeeze it quicly in a vise. You now have a slightly longer point contact a little closer to the pivot pin of the sear. Polish this contact end and I assure you the trigger pull will be 1/2 lb lighter. Be sure that only the tip engages the sear tho. Try it ,you will be surprised"

I was wondering if anyone has tried or has comments/cautions on the process. I have a few spare sear springs, so I may give it a try and see how it works.

[sams1]

This is VERY interesting! Thank you for sharing, Todd!👍

Definitely curious of what you find doing this mod to the sear spring. Based on Austin Behlert's description, it should work!

[CXM]

Interesting...

I'm concerned the heating might take the temper out of the spring... Plus I'm not sure I can feel a 1/2 lb difference in trigger pull... Still as a part of overall trigger work a half pound is useful.

Thanks for sharing... I had not heard of it.

FWIW

Chuck

[ToddSig]

On the other forum, TNorris points out the SFS sear spring and BHSS optimized sear springs do not have the kink at the tip of the spring. It is flat. Tim notes when he uses he gets about a 1/2 pound trigger pull reduction. The BHSS spring has a narrowed upper portion when compared to the FN part, and I am not sure the radius is the same. The BHSS SFS spring was originally designed by Leon Hubert for FN. So it appears the concept is correct. Perhaps in addition to spring changes and polishing, either straightening the FN sear spring or replacing with a BHSS sear spring could be part of an overall action job and enhanced trigger pull.

Image of the BHSS sear spring

[Bob Reed]

Hello, Todd & All,

I've haven't heard of this modification for the BHP, however, the sear spring in the S&W Model 422/622 Target Pistols consists of a short, flat/straight leaf that contacts the sear closer to its axis pin than more towards the bottom edge of the sear like one would expect. There is also a 'rib' across the sear where the spring contacts it, and whether by design or not, it reduces the amount of contact (rubbing) between the 'tip' of sear spring & sear.

So, in theory, I can see Austin's modification reducing the pull a bit.

[ToddSig]

A quick update. I am working on updating some internals on a Hi Power I recently purchased and had the opportunity to try the Austin Behlert recommended sear spring adjustment. It does work, and I am getting closer to 3/4 lb reduction in the trigger pull on a Lyman digital. Easy process for a slightly lighter trigger pull.

Will post later on the new Hi Power and my enhancements.

Before and after image of the Behlert sear spring bend