StainLess Steel MediaTitan ReloadingGraf & SonsMidSouth Shooters Supply
Inline FabricationLee PrecisionRepackboxWideners
RotoMetals2
Results 1 to 9 of 9

Thread: Need a little help with Crossman Air Pistol

  1. #1
    Boolit Master WRideout's Avatar
    Join Date
    Oct 2009
    Location
    Butler, PA
    Posts
    1,055

    Need a little help with Crossman Air Pistol

    A couple of years ago, my beloved wife bought me for Xmas a Crossman 1377 air pistol; variable pump kind that has been around forever. I have been shooting it in the basement range, and lately found it to be extremely stiff to pump. I checked it over, and did not think it was a linkage problem on the pump arm, so the piston was the only reasonable part left. I figured out how to disassemble it by driving out the roll pin that holds the pump arm and front sight assembly to the front of the pistol. Got the piston out, and the seal cup was cruddy with some type of rubbery powder. I cleaned off the cup and inside the cylinder with brake cleaner, and all seemed well. Then I started reassembling the gun.....

    It turns out that the roll pin from the factory is so tight it has no spring at all, and is more like a piece of drill rod. The plastic sight assembly slides around, and the pressure that it takes to drive in the pin knocks the sight out of alignment. I can get the pin through the holes on one side, but when it hits the opposite side, it is hitting the hole off-center. I thought of a couple of possible fixes:
    1. use a slightly smaller roll pin, or at least one that has some spring in it so it will compress.
    2. Use a solid taper pin
    3. Make a tapered pilot, like a clutch line-up tool, that will line things up, then be driven out of the way by the advancing roll pin.
    4. Grind a slight chamfer on the factory roll pin and reinstall.

    I don't want to introduce any looseness to the assembly. What would anyone recommend? Thanks.

    Wayne
    What doesn't kill you makes you stronger - or else it gives you a bad rash.
    Venison is free-range, organic, non-GMO and gluten-free

  2. #2
    Boolit Master 35 shooter's Avatar
    Join Date
    Jul 2013
    Location
    collins ms.
    Posts
    2,106
    First time I took mine down like that, I had to brace the air cylinder really hard against something to get the pin back in. Had to hammer it much harder than I thought should be necessary, but the holes were lined up and I eventually got it back in.

    I went to the “air werks” site and ordered a solid steel pin that screws tight to the cylinder.... no more loose sights or problems since then.
    I did have to ream the offside hole just a bit to get the steel pin to go through it as there was a bit of a small burr on the inside of that hole.
    I really like the steel pins much better than the roll pin that comes on the gun.

    You might could polish that hole a bit with an undersized drill bit and a bit of sandpaper? I wouldn’t try to open it up, but just polish in case off a burr.
    I think the steel pins with the screws like I bought for mine are like $10.00 plus shipping if I remember right....really worth it in my opinion.

  3. #3
    Boolit Master WRideout's Avatar
    Join Date
    Oct 2009
    Location
    Butler, PA
    Posts
    1,055
    Thanks, 35 Shooter. I had a feeling that aftermarket parts would fix this one.

    Wayne
    What doesn't kill you makes you stronger - or else it gives you a bad rash.
    Venison is free-range, organic, non-GMO and gluten-free

  4. #4
    Boolit Buddy

    nvreloader's Avatar
    Join Date
    Jan 2016
    Location
    Western NV
    Posts
    108
    Wayne

    Here is another site that has good info on your Crosman pistol.

    https://www.gatewaytoairguns.org/GTA....php?board=4.0

    HTH,

    Tia,
    Don

  5. #5
    Boolit Master WRideout's Avatar
    Join Date
    Oct 2009
    Location
    Butler, PA
    Posts
    1,055
    Thanks, NV. I went ahead and ordered the replacement pin recommended by 35 Shooter. Keeping my fingers crossed. Also, I finally read the owner's manual, and it actually says to oil the pump cup a little, which I thought was verboten with air guns. That's probably why it got hard to pump in the first place.

    Wayne
    What doesn't kill you makes you stronger - or else it gives you a bad rash.
    Venison is free-range, organic, non-GMO and gluten-free

  6. #6
    Boolit Master 35 shooter's Avatar
    Join Date
    Jul 2013
    Location
    collins ms.
    Posts
    2,106
    On my 1377, the front sight had a lot of wiggle and wanted to lean to the left. I tried shimming it, but that was a temporary fix. It would always work loose again over time.
    I tried the steel pins with screws from Airwerks, and it has held tight in place ever since. I’ve probably run 3500 to 4000 pellets through it since then.

  7. #7
    Boolit Bub
    Join Date
    Nov 2015
    Location
    Idaho
    Posts
    73

    Cool

    WARNING: A Crossman 1377 (and others like) can be black hole for your wallet! As others suggested, get the aftermarket pin set. I did reuse the the roll pin for awhile but it does wear on the pump arm. A slight chamfer does help on reuse, as does using a punch for alignment. The aftermarket pin is so much easier! Oh, and get the stock, it makes it fun to shoot with a red dot or scope! I am currently wanting a 1322. The CO2 does get spendy for the 2240, but the wife like to shoot it. AND do oil, grease or silicone as needed. Check those web sites for more info.
    Last edited by trebor44; 11-03-2018 at 11:40 AM. Reason: Added more info
    West of Beaver Dick's Ferry.

  8. #8
    Boolit Master WRideout's Avatar
    Join Date
    Oct 2009
    Location
    Butler, PA
    Posts
    1,055
    Shooting that little Crossman is about enough fun to be illegal. I have improved my pistol shooting by being able to practice at home for next to nothing. I don't feel a need for a lot of mods to the one I have, but I know some people just can't leave them alone.

    Wayne
    What doesn't kill you makes you stronger - or else it gives you a bad rash.
    Venison is free-range, organic, non-GMO and gluten-free

  9. #9
    Boolit Master WRideout's Avatar
    Join Date
    Oct 2009
    Location
    Butler, PA
    Posts
    1,055
    I put in the replacement pin today, and shooting the Crossman is a whole new experience now. Thanks for all the help, everybody; I'm back in business.

    Wayne
    What doesn't kill you makes you stronger - or else it gives you a bad rash.
    Venison is free-range, organic, non-GMO and gluten-free

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check