Tuning Crosman 1377

[survivor45]

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Let me start this off by saying I’m no expert at this stuff. I’m just an old guy who likes to tinker with stuff. Most of these upgrade ideas I got off of the YouTube.
So, I’ve had this gun for about 20 years. Way before I even knew what a PCP air gun was. Now that I’m back into airguns. I thought I dig it out and shoot it a little. Well it shoots pretty darn good. So I started researching upgrades. Once I heard of the steel breach I knew I wanted that. And I must say. It’s very reasonably priced. And simple to install. So while waiting for my steel breach to show up I started working on upgrades I could do myself. I’m a hobby machinist so it’s normal for me to try to make or improve parts rather than buy them. First up is trigger and sear pins. The factory pins are .125” Dia. Well a #30 drill is .128” Dia. That will help tighten up some trigger and sear slop. Here is the drill ruff cut then I grind to length. 

Next I punched out some shims. I have a pretty good process for doing this. But that could be a whole thread by itself. I made two .010” shims for the sear. The trigger got two .010” and two .005”. .015” on both sides. 

I also lightly polish all the mating surfaces. Trigger , sear and hammer. 
Im still working on lighting the trigger spring. It’s still kinda heavy so I won’t cover that just yet. 
Next I made a pin to replace the roll pin that holds the pump arm in place. I took a pice of .187” Dia stainless steel rod. Cut and ground to length. Then drilled and taped for 4-40 screws . You see here I have no lathe but it’s only one part so not that big a deal. Drill here. 

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Tapping here 

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An Allen head screw would look nicer. But this was all I had in the shop. It is however stainless.

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Next I replace the screws that hold the trigger housing/ pistol grip on. Stainless steel socket head screws. Cut and ground to length .

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Then I got the steel breach in. It was very simple to install. I’m pleased with it. For optics. I have a vintage Aimpoint 2000 red dot.

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Now I just need to work on my pistol shooting skills. There are some of the first groups 10 yards with Crosman Premier 10.5 grn. @ 5 pumps. They look good but the groups have seemed to opened up. The trigger is still too heavy. No creep. But heavy. So I’ll need to work on that. 

So that’s all for now. Hope this thread inspires someone to tune or rebuild an old 1377 or 1322. 

 

[KevininPa]

Thanks! I have a 1322 that's about as old as yours. You have some pretty simple mods there. I like them. Believe I'm capable enough to handle those.

 

[provels]

FWIW, I found a lighter trigger spring for my mid-80's rear cocker at Ace Hardware.

 

[Feinwerk]

It's been awhile but I seem to remember cutting a few coils off of the trigger spring. Also, you can get some molybdenum disulphide grease 'moly g' paste or similar, and lightly coat the sear surfaces.

Good luck,

Feinwerk

 

[MileHighAirGunner]

There’s a vendor on eBay that sells a SuperSear for the Crosman 13xx and 22xx pistols. Little pricey but well made and it’s a big improvement over the stock trigger sear. They are a drop in replacement and don’t require any modifications of any kind. The SuperSear alone makes a big difference over the stock trigger and the adjustable sear spring just helps even more. It’s not a 1701 trigger group but it’s about the next best thing. I also found a trigger shoe helps give the trigger the feeling of having a reduced trigger pull because of the extra width it provides to the trigger blade. Baker Airguns sells them for $9.95 compared to other on eBay that want 3 times that. If you’ve order from Crosman’s custom shop before you can get them from Crosman also. 

 

[survivor45]

Hmmm interesting! I hate the trigger profile. It’s just too round. I feel it puts your finger too high. I’d like it as low as possible on the trigger to get a little more leverage. I’ve thought of severely modifying the trigger face of the factory trigger. Making it flat. 
Im not sure how much more time or money I’ll put into my gun. But i always enjoy seeing aftermarket upgrades and DIY modifications. 

 

[MileHighAirGunner]

Hmmm interesting! I hate the trigger profile. It’s just too round. I feel it puts your finger too high. I’d like it as low as possible on the trigger to get a little more leverage. I’ve thought of severely modifying the trigger face of the factory trigger. Making it flat. 
Im not sure how much more time or money I’ll put into my gun. But i always enjoy seeing aftermarket upgrades and DIY modifications.

I have a couple of these 1911 triggers from TKO that I don’t use. I’ll give you one to try if you want. I don’t use them. Just PM me and I’ll mail it to you. No charge. 

http://www.tko22.com/Section8.html

 

[JohnL57]

I lightened the trigger on my 1322 with the 'squash mod'. Remove the spring and slip it onto a Philips screwdriver and squash it shorter. Reinstall and test to see if the sear engages- if it does, you're good. If not, stretch it out a little at a time till it does. I read about it some where-it worked well for me.