My 1st 1377 Carbine Project

[Nate the airgunner]

A good lookin 13xx you have, I'd slap an AO scope on it if I were you.

[FuzzyGrub]

The sun finally came out today, and I got some pre-lim fps numbers.  Only a few shots at different pump numbers.  It was 20F so wasn't going to go thru 10 shot strings for each. Pellets are cphp.

5 pumps: 533 fps ave
7 pumps: 615 fps ave
10 pumps: 685 fps ave
15 pumps: 746 fps ave

[squallywally]

Primo fuzzy, this looks and shoots fantastic.

[trigger]

Should I get a flat top piston before I make 10+ pumps per shot, or can I do that on the stock piston? Also, how would a red dot scope work out?  Last question here, where do you Purchase the extended barrel?

[FuzzyGrub]

I had no problem pumping to 12 with the stock piston, but not gaining much and would need the heavier hammer spring to use it, if it did. 

The barrel is from Crosman (Discovery) about $17, but the sleave, sight mount, etc will double that.  Unless you are planning to use the "iron" sights, the william optic are a bit pricey.  I think that was another $30 for the two.

The two red dots that I have are for weaver/pic rails.  Using an adapter would put them too high for my tastes.  Otherwise, I would have tried them.  I have the longer metal breach, so there should be enough room to mount them in front of the bolt.  Or an offset mount on the back. 

[BenjiHunter]

Very nice gun.
Good job.

[2nd RCHA]

That's Great!, I just love modding my 2240's, 2289's, and 1322's. One of my favourites has to be a 2240 I turned into a real tack-driver. I added a .177 Crosman steel breech, 10.1" Lothar Walther barrel, Custom camo'd shoulder stock, and topped it off with one of Larry's(Airgun Artisan's) 16-hole ported m/b's, This beauty can stack rounds one on top of the other all day long, and w/ a m/v nearing 600fps w/ lead, and around 725fps with Skenco Black Max alloy rounds. topped out at 750fps with Crosman SSP's which is cool even though the rounds come in at less than 5gr.
The 2289 I've modded came out great as well, Flat-Top-Piston, US Valve, Crooked Barn Aluminum breech, 24" barrel(meant for a 2260), and lastly one of Larry's m/b's, It's deadly in the accuracy dept,., and power-wise it's no slouch sending a 14.3gr Crosman dome downrange at 725fps, and with alloy rounds you can easily add 25% to that(especially w/ Crosman SSP's, which are extremely accurate), I'd like to add that Pellet selection is crucial to any Crosman build as the rifling in their barrels is very slight. I highly recommend using JSB's, Air Arm's, FX, and if you can find them Kovohute Standards/Boxers have a great lead composition for their pellet's, almost pure lead with very little antimony used which translates into the pellet really gripping your rifling, I also wanted to add that the barrel length plays a big part in your gun's m/v If you can't get a 24" barrel, an 18" will do, http://scopesandammo.com/storefront/product_info.php/crosman-22-caliber-18-barrel-p-741 , I also wanted to add that "Scopes and Ammo" has one of the best selection of after-market/third party accessories you can find, http://scopesandammo.com/storefront/index.php/airgun-parts-custom-service-c-38 , Hope this helps. Cheer's, Andy.

[.22 Varmint]

Nice looking build, good job. Crosmans are a whole lot of fun to tinker with.

Andrew 

[1377x]

if you want a 26" .177 barrel for your 1377 they are available too
if your red dots are tube style like the center point,tasco pdp or millet sp red dots any height 30mm or 1" scope rings fit perfectly