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This was the first airgun I purchased and modified. It started as a stock 1377c(phase 3). I have done a lot of mods to this gun and I absolutely love the way it looks and shoots. Here is a list of the modifications I have done to date:
16" Crosman .177 cal barrel prepped and crowned by Tim McMurray at Mac1 Airguns
RJ Machine steel breech milled with cutouts for open sights by Robert Jones
RJ Machine .177 cal bolt with extended probe and large handle by Robert Jones
RBGrips Walnut Replacement style grips with Walnut super pumper forearm by Ralph Brown
Carbon fiber muzzle brake by Larry Rollins
Custom aluminum wire frame stock by Gil Irvin
Leapers 'Bugbuster 2' 6x32AO mildot scope with dual illuminated reticle(red or green)
Accushot medium profile scope mounts
Crosman custom black trigger shoe
Ernie's trigger spring by Ernie Fuentes
Barrel band modifications done by me with a dremel
I get about 610 FPS and 5.76 FPE with RWS Diabolo Basic 7.0gr on 10 pumps. There are no internal mods to this gun so there is a lot of room for improvement in the power department. I am mostly interested in accuracy at fairly short distances with this gun though. I may do some power mods to it one day such as some valve mods and a flat top adjustable piston. Right now I am perfectly happy with it's performance though. I believe this is my most accurate gun by far.