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Air Gun Home Forum Index » Pistols » Modding A New 1377 Query    View previous topic :: View next topic  Modding A New 1377 Query   Posted: Tue Oct 19, 2010 4:46 pm PelletPutter Member Joined: 29 Sep 2010 Posts: 21 I had recently purchased a new Crosman 1377 pistol with intentions of modding it. I bought a 24" barrel from Crosman & also the steel breach kit. The breech kit diagram showed a breech gasket which was not in the kit, nor did my new 1377 have a gasket. The pic showed it to be under the steel sleeve that joins the breech to the barrel. I went ahead & installed the kit without the gasket & ordered the gasket. Is this gasket something that is necessary & what type of gasket was it supposed to be? As for the 24" barrel, I am not getting a good shot pattern at all. That's with 10 pumps .Should I see about getting it cut to maybe 18" ? The gun is presently equipped with a skeleton shoulder stock & a 1389 pump arm. Other than perhaps a muzzle brake to improve it's looks, it looks pretty cool now. However, it shoots lousy. Any suggestion would sure be appreciated.. Thanks.   Posted: Tue Oct 19, 2010 6:41 pm tkerrigan New Member Joined: 01 Sep 2010 Posts: 3 Location: Jefferson, Oregon The gasket is square o ring, it may be in the tube. If it got lost, the transfer port won't be sealed, therefore shooting all over the place. Drape toilet paper over the transfer port area to see if air is escaping. Good luck   Posted: Tue Oct 19, 2010 9:11 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" tkerrigan wrote: square o ring That could be confusing- it is a round o-ring that is flat on two sides- more a seal than an "o-ring" really. Apparently the 1377 in this case got it missed at the factory, or it fell out during disassembly and you didn't see it, PP. As tkerrigan has indicated, get one and install it- you are likely losing alot of air causing the poor shot consistency. Also, did you install a .22 cal 24" barrel or a .177 cal 24" barrel? _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Wed Oct 20, 2010 3:45 am PelletPutter Member Joined: 29 Sep 2010 Posts: 21 Thanks for the reply.. The 24" barrel is a .177 cal. Crosman had said they were out of the .22cal barrels. I wonder if I might be able to install the seal without having to punch out the front roll pin? The pin can be a real chore to remove & reinstall. I was very careful in disassembling the gun & did not see any gasket [seal]. However, I am not completely sure in the direction that the little steel sleeve goes. It has a long side & a short side. One has to look at it very closely in order to see it & there is no mention of its direction in either the manual or the schematic. ?   Posted: Wed Oct 20, 2010 11:42 am rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC The steel sleeve goes with the short end dow against the rubber seal.... You only need to remove the barrel and breech to replace the transfer port and seal.... and probably loosen the front barrel band clamp screw.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Wed Oct 20, 2010 1:55 pm PelletPutter Member Joined: 29 Sep 2010 Posts: 21 Thanks Bob for that info. I understand that the seal is a O ring type with square edges. Wonder if I could substitute something else, maybe from a hardware store? Otherwise, I have to wait a week or so for one from Crosman Modding A New 1377 Query     Air Gun Home Forum Index » Pistols You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." Your browser cookies have been reset or you need to register to access the topic in question. Use the 'Register' button near the top left of this page. Click Here for AirGunHome.com Main Page Powered by phpBB © 2001-2004 phpBB Group Partial Styling Supplied by Vjacheslav Trushkin Themes Database.