Jake ; I have a 1377 . It's stock internally though . It has a .177cal. 14" barrel with a RJ Machine long breech , 2289 pumper forearm and matching Crosman green grips .2289 barrel band , and a stainless steel pivot pin . IIRC ; on 10 pumps it shot around 600fps with JSB 8.4's . It also has a new Red dot sight with 3/8 dovetail to weaver bases . The red dot has 4 different reticules . The red dot is only a couple of weeks old . I have around $200 in the rig , I'll take $150 shipped for it. $125 without the Red dot sight and bases . If you're interested , I can chrony it tomorrow and take a picture or two for you . When I got it out to shoot when I got the Red dot , it aggravated the wrist injury I had back in February . I also have one with a 12" barrel and RJ Machine steel breech , that has a super nice set pf green laminated RB grips with green 2289 pumper arm . Same deal but no red dot or sights . ($150 shipped ) IIRC it shot around 575fps on 10 pumps . kirby