Author Topic: RM 377 Trigger Job (Read 1380 times)

nixsrs93 · « **on:** May 15, 2006, 01:22:11 PM »

I just did a great easy trigger job on my RM377. I was doing some analysis while I had my stock off to refinish. I took off the two locking keys that secure the pin that holds on the trigger. I then tapped out the pin, and pulled gently on the trigger to remove. It was held up by a small spring. The spring fell out and I thought I would never get it back in. So, I just put it back together and it looks like all the little spring did was add about 6 lbs to the trigger pull. I have since shot about 50 pellets through it, and all shots broke crisp at about 4 lbs. 10 lbs to 4 lbs, and it took all of about 15 minutes.

Anyone know if removing this spring will cause any long term damage?

This is my first pellet gun since a Benjamin pump when I was 11 (20 years ago). I am really enjoying my cheapo little mexican crossman. I am in the process of refinishing the stock, and have a leapers 4x32 AO airgun scope on its way. The leapers is replacing a 2 power Tasco that was ill suited for the purpose. Even so, I have managed several 1.5" (5 shot) groups at 25 yards with a crappy scope and a 10lb trigger. I hope the better trigger and scope will reduce that group size.

Anyone ever rung out one of these mexican cheapies for accuracy? How good can I expect to get it? Any tricks to learn? Any recommendations?

Thanks,
Nixsrs93

dave · « **Reply #1 on:** May 15, 2006, 02:40:45 PM »

Without that spring, its possible for an accidental discharge to occur either by bumping the gun, dropping the gun, or sometimes just closing the barrel can do it. One end of that torsion spring is set into the back of the trigger, the other goes into a hole in the bottom of the sear plate and is what sets the sear and holds it in place. Without it the sear may not set properly. A small number of Mendoza rifles were recalled a few years ago because of an issue very similiar to this.

nixsrs93 · « **Reply #2 on:** May 15, 2006, 04:05:19 PM »

Can this occur even with the safety on?

Do you know the drill to lighten the trigger properly?

Thanks,
Nixsrs93

dave · « **Reply #3 on:** May 15, 2006, 05:29:57 PM »

Yes it can, since the sear doesn't fully engage. Getting the trigger to acceptable levels pretty much requires a complete rework- making a new spring, reprofiling the sear etc. Not something you would want to get into if you don't know what you are doing. It's not really worth the effort on a gun that is mediocre at best anyhow.

nixsrs93 · « **Reply #4 on:** May 17, 2006, 04:07:23 AM »

dave,

Tonight I plan to cock the rifle and then try and strike the trigger assembly and barrel with a rubber hammer to see if I can get it to go off.

I will report what happens tonight. Don't worry no pellets will be in the barrel.

Thanks,
Nixsrs93

nixsrs93 · « **Reply #5 on:** May 23, 2006, 02:27:01 AM »

Well I have been beating on the thing with a rubber mallet, and I can not get the thing to go off. I even did some drops on the buttstock, with still no accidental discharge. Maybe mine is a fluke.

Just added a Leapers 4x32 AO Airgun scope with one piece base. It looks and shoots great. This afternoon I am going to do some serious paper punching.

Thanks,
Nixsrs93

nixsrs93 · « **Reply #6 on:** July 03, 2006, 02:15:22 AM »

UPDATE!

My little cheapy with a home done trigger job is still clicking along. I have put 1000 pellets through it since the trigger work with no problems. I have since refinished the stock in a dark walnut stain and about 20 coats of tru-oil.

The accuracy of this little rifle is really good, and I love the leapers scope I put on it. From 25 yards it will put 5 shots within 1/2" if I do my part. Yesterday I was hitting plastic motor oil cans from 75 yards, using the second dot down on my ballistic plex reticle! I had no idea an airgun would be so fun.