How to lighten 92fs single action?


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Mark13
March 24, 2005, 05:32 PM
I like my 92 fs, but want a lighter single action pull. Double action is fine. I notice (it has laser grips) that single action dry firing will pull the laser dot straight down about 8 inches at 20 yards. If I squeeze slowly and gently I can eliminate this, but anytime I pick up the pace it starts dropping down again.

What is the 92fs single action trigger weight? I have disassembled all the frame parts, so it wouldn't be a problem for me to swap something out.

I've got a 3.5# connector in my glock that I love, I'd like a similar weight trigger in single action for my 92fs.

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MoNsTeR
March 24, 2005, 06:38 PM
Wolff 16# hammer spring makes a big difference.

JeffC
March 24, 2005, 06:46 PM
A speed bump trigger from Ernest Langdon would help you with the muzzle dropping. Some Berettas have too much overtravel on the trigger. You could go to a lower pound mainspring but if your gun has alot of overtravel you'll still need to overcome that issue. In fact, a weaker mainspring 'could' make your shots throw lower (at distance) due to longer lock time if you don't overcome the excess overtravel.

www.Langdontactical.com

lindermant
March 24, 2005, 07:16 PM
Trapper Gun Inc.
30183 Gratiot Ave.
Roseville, MI 48066
586-776-7581

they sell reduced power sear springs for the Beretta 9X series (IIRC, it's about $2).

hope this helps...

Mark13
March 24, 2005, 07:24 PM
I want to keep the hammer power for reliability, and I think the double action pull is fine, so I I'd like to keep the mainspring stock.

My trigger doesn't seem to have much overtravel, but the I'll look into the speed bump trigger.

Any downside to a lighter sear spring? Besides making the lawyers upset?
Whoa $2

Thanks everyone.

Steve in PA
March 25, 2005, 12:11 AM
I think you have your actions mixed up.

"Double action" is the longer trigger pull (which is what I think you want to lighten). It's called double action because you are cocking and firing the pistol with one pull.

"Single action" is the shorter of the two. The pistol will already be cocked (hammer back), therefore your only action (single) is pulling the trigger until the sear disengages.

On the Beretta board I believe they have said to replace the main spring with one from a "D" model.

Mark13
March 25, 2005, 06:18 PM
Actually the long pull is fine, I want to lighten the short pull for target work.

Steve in PA
March 25, 2005, 11:17 PM
Well I'm lost. How can the long double action pull of the Beretta be fine and the shorter single action pull be pulling you off target?? You mean that you can hold the laser on target through the double action pull, but not the single action pull??

Mark13
March 25, 2005, 11:44 PM
The long pull moves the laser dot horizontally, but it's pretty smooth, so it's not too bad. I think this is from the changing angle of my finger on the trigger as I pull through the stroke.

The short pull is more abrupt, it breaks, and then the trigger hits the frame. This is what is pulling the beam down. So if the trigger is breaking at 5 lbs, then that force is getting tranferred to the frame when it hits. The trigger is hinged at the top, unlike a 1911 which comes straight back, so I think it is pulling the barrel down.

I found a lot of places online that sell the Trapper Gun spring kits, but not one with just the Beretta sear spring?

Kamicosmos
March 26, 2005, 01:14 AM
I think you're looking at the wrong problem. If you are seeing the laser dip in single but not double action....I don't think it's the trigger, I think it's your finger!

Stock the 92/96 has a what....14 pound DA pull and a 8 pound SA? Something like that. So...I don't see how the SA would be causing you to nose dive because of an overtravel issue. AND, you still have the exact same amount of overtravel in either mode...

And the sear spring has nothing to do with this. There is only one sear spring in use in both DA and SA modes, so it can't be that.

:confused:

9mmepiphany
March 26, 2005, 02:45 AM
shooting better in DA than in SA isn't really that odd. it happenes all the time in DA wheelguns. it takes more concentration to roll back a DA trigger, that is why we used to shoot DA, in PPC, all the way out to 50 yards.

1. a hinged trigger would not cause you to pull the barrel down...if it could influence the barrel at all, it would pull it up. if you believe the trigger hitting the frame, after sear release, is causing the dip...that is overtravel and can be addressed with the langdon speed bump trigger.

2. the lateral movement of the laser during DA trigger pull would seem to indicate that you don't have "enough finger" on the trigger...you might look into a "short trigger" too.

3. changing your mainspring to the one from the DAO 92 is a standard modification for better trigger control...it is even approved by the factory.

4. my first suggestion, to you originally stated problem, and one that is reinforced as i continued to read your followup post is really pretty simple...you're flinching. if you can shoot DA without the barrel dipping, but it is consistently dipping in SA, you are jerking the trigger.

Mark13
March 26, 2005, 09:50 AM
Yes you are right, I am probably jerking the trigger, but the heavy trigger pull makes it worse. The sear spring I'm talking about is the little clip that holds the sear against the hammer.

I've heard about changing to the D model mainspring, I assume that it has the power to be reliable. What is the D model? I have a recent model 92fs (2 years old).

Does anyone know what just this change will drop the SA/DA pull weights to?
14/8 pound trigger pulls is way too high for what I want.

Thanks

lindermant
March 26, 2005, 10:03 AM
Swapping in the 'D' hammer spring should yield the following results:

~8# DA
~4-4.5# SA

Adding a reduced power sear spring to the above would drop the numbers a little bit more. You can find more info here:

http://www.langdontactical.com/services.shtml

medmo
March 26, 2005, 01:01 PM
Install a DAO main spring. You can order them directly from Beretta USA. Any other problems and I would talk to Mr. Langdon. The DAO spring in the DA/SA is 100% reliable.

MoNsTeR
March 28, 2005, 10:15 PM
BTW, I've had zero misfires with the 16# Wolff spring, in at least 3000 rounds since I put it in.

Island Beretta
March 29, 2005, 05:16 PM
I too was more accurate with the Beretta DA pull compared to the SA pull because of the abruptness of the SA trigger pull, light as it was, whilst the DA pull was heavier but buttery smooth.

I went with an ISMI competition wind 17# 1911 main spring along with the Wolff trigger conversion. This coupled with some polishing and a slight adjustment to the hammer/sear engagement angle and the SA action abruptness was removed. The competition wind spring really removed the stacking and so you had a continous tension trigger pull throughout both in DA and SA. The wolff trigger conversion also increased the pre-travel and overtravel weight thereby helping to reduce the abruptness and also not having the trigger going dead during the overtravel which causes the slam into the frame..

Mark13
March 29, 2005, 07:08 PM
I ordered a "D" model spring from Langdon, will let you know how it works.

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