Trigger Job Mossberg 640KD 22 Mag Rifle???

[Dave1]

Just curious, how much of a job is it to do a basic trigger job on an old Mossberg Model 640KD 22 mag bolt action rifle? Is this something you can do yourself or would you have to have a smith to do it?

My old gun's trigger needs some help. It is heavy and rough and has a lengthy pull.

Is this just a matter of trimming a spring to lessen tension or will it likely need more work?

Dave

 

[ogree]

Take it to a smith, he will probably have to do some stoning on the hammer,etc. if I remember right.(Been years since I did my 342)
Clipping springs is not a good idea, and is usually done by individuals who don't know how to obtain results by any other means.
To lighten a hammer spring too much will actually result in more felt creep when pressing the trigger.
Sometimes it is hard to spend a chunk of cash on gun work when the firearm in question is not a high dollar item, but if the end result is something that you are pleased with, the sting of the cost will fade over time.

 

[Dave1]

Considering the age and condition of this gun and the cost to have a smith work on it, I might be better off buying a new gun that has a better trigger and action.

Dave

 

[ogree]

Unfortunately, most of the rimfires rifle out there have poor triggers on them, Seems no one pays any attention to producing a rifle with a nice crisp trigger out of the box cause they are "just 22's".
Personally, I like my Mossbergs......so it's worth it to me to do the work on them.

 

[Dave1]

How much of a job is it to do a "trigger job" on one of these rimfire rifles?

Looking at the trigger, there doesn't seem to be many moving parts to it. I wouldn't try it without some guidance from someone that knows what they are doing, but it doesn't look like it would be or could be too tough of a job.

Any idea what a smith would charge to do it?

Dave

 

[ogree]

It is not really difficult, it is just time consuming. The trigger mechanism itself is a simple one, the sear needs to be stoned to smooth out any burrs without rounding the edges as well as putting a break angle on it. The hammer engagement may need to be reduced.
The trigger spring will probably have to be tweaked.
This is all hand work and will require some stoning and then re-assembly to check the results, then dis-assembly and some more stoning, etc. until the desired result is achieved.
Don't know what you would be looking at cost wise so you will have to shop around for someone who is willing to work on the old mossbergs as well as having the time to do so.
You could always get a stone and do it yourself, working slowly and checking often.
If you go too far and ruin one of the parts, replacements are available from gun parts corp. and are relatively inexpensive.

 

[Dave1]

I have lots of time as I am recently retired, just don't know anything about trigger mechanisims.

Is there anything online about to remove and disassemble the triggers and do the work? It would help to have some kind of guide or pictoral step by step instructions.

Dave

 

[Jim K]

Hi, Ogree and Dave,

I strongly recommend not stoning the parts on that gun. Mossberg internal parts are case hardened and it is very easy to cut through the case hardening, with a ruined sear or firing pin as a result. And parts are no longer available for many Mossberg models.

My recommendation is to get used to the trigger rather than stoning or filing it.

Jim

 

[ogree]

Jim,

I didn't know about the case hardening, I have had no problems with my 342 after the trigger job was done but I do see your point.
Just checked on gun parts web site and they do have Mossberg 640 parts available.
So I guess the question is, do you want to risk it Dave ?
I'm not going to say "go for it and hope for the best" cause I in no way have all the answers.
There are just way too many variables in the realm of firearms.
I can only attest to the things I have accomplished.
I have been meaning to pull apart my 640 for a while but haven't had the time..........I guess I'll have to take a look at it.

 

[Dave1]

If/when you disassemble your 640 trigger, try to remember as much as you can and coach me thru it.

Dave