crosman 1377 trigger

[Grizz]

my 1377's trigger is aweful.

anyone ever done trigger work on them, recommendations?

anyone have an exploded view drawing?

suggestions welcome

thanks

Grizz

[JReed]

I polished mine with 0000 steelwool. They are realy easy to take apart take the grips off then remove the plate on the right side of the grip frame once you have it open it will all make sence. Not of caution be very careful that you keep track of the spring with the itty bitty ball on it this is the detent spring for the safty dont ask me how I know but the safty just flops from side to side if you lose this spring. Once you have it apart you can see how the trigger works just polish the part that the sear rides on to get rid of the burs you will notice a big improvment in the feel of the trigger.

[Grizz]

Thanks for that. should help get a better let-off...

[JReed]

Yep makes it much smoother feeling doents do anything for the weight though. But anything is an improvment .

[AmBraCol]

There's a few tricks to getting a better trigger on the Crosman pistols. One, as mentioned, polish the sear's engagement surface. But you can also reduce the sear's engagement surface so that less of the sear is being dragged when you squeeze the trigger. You do this by grinding the sides of the sear to produce a narrower sear face. Don't grind the face itself, just the sides. Then install a lighter spring, a spring guide helps. A piece of those "plastic" ram rods works fine. I think they're made of Delrin or ???. Just cut off a chunck that's too long to fit into the slot. Chuck it in a drill and use a file to work it down. Once you get it to where the spring will slide up and down it smoothly you can then cut it off at the end that was chucked in the drill to provide a lip to hold the spring - and a smooth surface to push against the sear. You need it just long enough to allow the sear to disengage. These treatments - a narrower, polished sear engagement surface, a lighter spring and a spring guide - will give you a pretty decent trigger. As mentioned above - be VERY careful with that tiny spring and ball in the safety device.... unless you don't care to keep the safety functioning.

[Hobie]

Yep, I've got an exploded drawing in my article about my 1377...

[AmBraCol]

Using Hobie's parts diagram, check out the sear - part number 1322A048

That's the part that you can modify to improve the trigger pull. That hook on the rear of it can be ground down from the sides. You can begin a kind of wedge shape - with the point towards the rear - that reduces the surface that contacts the striker on cocking. The diagram Hobie posted is of the older version of the pistol. You can go to http://www.crosman.com/airguns/service/ ... an-pistols to obtain a diagram of the more modern versions.

Check out also part number 111-030 - the sear spring. The fellow at Crooked Barn told me that you can go to Ace Hardware and obtain a lighter weight spring from their generic spring section. That, along with a spring guide, will also reduce the weight of the trigger pull. If you look at the diagram you'll see that the spring is held in place by a tiny bump on the frame. And that it merely pushes up on the sear. By using a piece of nylon or delrin or something like that you can turn one down on a simple hand drill. A drill press or lathe would obviously be much easier to do, but the hand drill works fine in a pinch. Turn it down using a file to work the material until the spring just barely slides on smoothly and will compress easily. You want it a bit long so that you can fit it in place. Cut it off at the large end to produce a smooth, slick surface to ride against the sear and to hold the spring in place. You then want to trim it so that it just barely allows the sear to disengage when the guide is just touching the bump on the frame. You can trim it a bit shorter, but allow for plenty of length so that the spring is not allowed to bend anywhere along its length.

These are quite fun little pistols. You can pick up a custom breech at Crooked Barn or RJ Machine and have an even better pistol. You can convert the 1377 to a 1322 if you want, using parts you can order right from Crosman. The 1377 is one of the most widely customized airguns around because it's fairly easy to do. A search on the 'net will net you a bunch of ideas. Mine? It's eventually going to get a different rear sight. Maybe a different front site as well. Time will tell. The plastic thingies from Crosman are an abomination, just barely adequate for the job. I had to grind the rear sight leaf down to bring the point of impact close to point of aim at 10 meters. With the Crooked Barn breach it's a pretty accurate little plinker. A whole buncha fun with pellets it likes.

[Modoc ED]

Edit: Picture didn't work. Can someone give me the info on how to post an attachment? Can't find out the new way with the paperclip showing on the post or give me the link to the tutorial.

Never mind -- think I found it.

The pictures loaded in reverse order. The sequence as posted, goes from bottom to top.

[Grizz]

thanks for the detailed specifics guys. I like that I can get trigger time in the house without swat swarming the place. I'll start with the polish and proceed from there.

I'm thinking about trimming down the plastic ears of the rear sight to be at the same level as the sight notch top. It's disconcerting to see that stepped rear sight, and the gun is shooting high at 24 feet. I would put a bead on the front to get the POI down, but I want this sight to resemble the pistol sight as much as possible.

The other weird thing is that the front sight isn't indexed correctly, it isn't exactly vertical. Might try a little heat but some plastics react poorly and unpredictably when heated.

thanks again for the great info and sources, all duly bookmarked and accounted for

[Modoc ED]

Here's a cool cutaway.

[Grizz]

Wow, thanks for those images Ed, that helps a lot.

[mescalero1]

AmBraCol,
Are you saying that breech can be installed on the pump gun, I went to Crooked Barn, I only see it on the Co2 guns.