Home Forums Hunting & Shooting Rimfires New Haven 740t (Mossberg 640t) trigger question

I was wondering if anyone has ever done a trigger job in this gun to lighten the trigger pull?

The one I have is very heavy breaks right at 7lbs

Thanks for any info

Mark

I have a 340BA, and added a trigger shoe. Helps a lot.

Yes, I've done a trigger job on my 640KD, which is very similar to the 640t model. If you attempt it, do yourself a favor and buy an extra sear and hammer from numrich. I would not attempt it without spare parts. Just a warning.


The trigger on this rifle went from crap and heavy to exceptional.

My understanding is to file away from each side of the sear leaving just more than a half.

Would you agree?

Not necessarily. There are threads on the web on this. Generally a 3 second search. Disclaimer, I am not a gunsmith, so take that for what it is. The sear should only be lightly polished, burrs removed to ease operation. Where you will need to reduce sear engagement is on the hammer. Do not change angles, it will need to be stoned and polished. Incase someone wines about the parts only being case hardened, it's easy enough to return the hammer to the original hardened state, if you know how. Now, as far as stoning and polishing, go slow and check often. If you over do it, you could end up with an unsafe trigger. I can't remember if I replaced the trigger spring as well, but that may also need to be done. The trigger mechanism is fairly simple on these rifles and parts can still be found. If you feel that you are not competent to do this work, take it to a qualified gunsmith..

Great advice. I have done a few searches on the net but since I'm not a gunsmith either, it's all a bit confusing because some people will stone & polish while I read others that moved pins & such.....
I even saw where one guy cut the hammer springs so it's only applying force from one side. Basically, instead of the spring catching on both sides of the trigger housing, one ear is clipped. I'm not comfortable at all with clipping my springs...

But yeah I will just hone and polish and that's it.

Great advice. I have done a few searches on the net but since I'm not a gunsmith either, it's all a bit confusing because some people will stone & polish while I read others that moved pins & such.....
I even saw where one guy cut the trigger springs so it's only applying force from one side. Basically, instead of the spring catching on both sides of the trigger housing, one ear is clipped. I'm not comfortable at all with clipping my springs...

But yeah I will just hone and polish and that's it.

Yep, I would not modify the parts by drilling extra holes. That's way bubba mods that should not be done IMHO. Check Numrich/gunparts corp. and see what parts they have. When I started on mine, I had 2 extra hammers, just as a fyi. While I was in there, I replaced every spring and also threw in new extractors and ejector. Works like new now. These are great rifles and most times exceptionally accurate. Good luck with yours..

Also, if you need extra magazines, the Savage 93R17 mags work very well with a slight mod. Those are very easy to find and reasonably priced.

Again, great advice. I am fortunate in that this one is in great condition doesn't appear to have been used much. It is a great shooter just would like the trigger lighter is my complaint.
Thanks
Mark

The triggers on these are horrible, so I completely understand. Good luck with it Mark!!