The ultimate 4566

[18DAI]

I will state again how talented you are BMCM - AND how lucky we are to have you here!

Thank you sir for the explanation and the solution to the issue! I think I will start looking for another drawbar. Best regards, 18DAI

 

[JohnHL]

I LOVE these technical challenges.

Just a thought...

Building up the area of the drawbar where the trigger hooks engage would certainly move the trigger (and consequently the SA pull) forward in the trigger guard, but that would also do the same to the DA pull.

I wonder if building up the rear of the drawbar (where it pushes against the sear to release the hammer in SA) would not have the same result without changing the DA pull?

Also, not to nitpick, but only the 9mm and 40s&w TSW models were fitted with the "delayed unlocking" (by means of decreasing the angle of the barrel and frame de-camming lugs by approx. 2 degrees).

The 45 standard and TSW models share the same cam angles.

John

 

[BMCM]

I LOVE these technical challenges.

Just a thought...

Building up the area of the drawbar where the trigger hooks engage would certainly move the trigger (and consequently the SA pull) forward in the trigger guard, but that would also do the same to the DA pull.

I wonder if building up the rear of the drawbar (where it pushes against the sear to release the hammer in SA) would not have the same result without changing the DA pull?
John

That's a viable idea too. That would enable the trigger to break well before the wall but also increase the freefall to the wall after the sear breaks so trigger follow through might be a problem plus this method will lengthen the reset.

I've got a number of spare takeoff drawbars in the bin. Perhaps some experimentation is in order to see what the best option is. When I have a bit of cash to burn I'll send a couple off to my micro welding guy. I need to determine what alloy of stainless they're made of first though. I'm thinking some form of 400 series or perhaps 17-4. It'd have to be some alloy inherently tough & wear resistant since these don't appear to be heat treated or hardened in any way.

Cheers
Bill

 

[JohnHL]

While nowhere near as durable as weldment, for experimentation purposes, a dollop of J-B weld applied to the rear of the sear, then judiciously filed and shaped, could prove this hypothesis without a great deal of expense and also be reversible (Rule #1 of ANY modification I espouse).

While the sear could be welded, I'm not sufficiently knowledgeable in metallurgy to know if the hardness of the sear hooks would be compromised by the heat of welding.

John

 

[RedCardinal]

WOW!!! I learned a lot about my all time favorite with BMCM's posts. I had to go open up the case and check my trigger. It is about the same as 18DAI's. But I am wondering why not shave the back of the trigger a small amount to get the clearance. I looked at the wide trigger, a la 645, that I am contemplating switching to, and it appears to be a tad slimmer also. The wider, slimmer trigger may solve both the pinching and slamming the wall.

 

[BLUEDOT37]

45CQB

Nice pistol, & of course I'm jealous.

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Here you go, I rotated the picture for you.

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[18DAI]

Thanks BLUEDOT37!

 

[RedCardinal]

Well, just disregard all of my comments. It ain't gonna happen. It is NIB and will be sold that way. I will go to my KSP 4566TSW instead. It does not need anything done to it.

 

[Stentor]

A CQB that I recently acquired; I will keep her as she came from the Performance Center.