harr!!!!
i got er done!! ive done every mod there is to do... i think
... except for a stronger hammer spring... but it doesnt seem to need one.
for the valve... i cut threads off, drilled out the inside, cut the exhaust on an angle & enlarged it, bored out check valve, shaped the plastic on the valve stem... ummm... polished stuff
great fun!
for the transfer port, i found an automotive vacuum cap... its white in color and is 1/4" OD. then i drilled out the hole in the barrel to 1/4" but not all the way through. the last part was enlarged with my dremel, so im not sure the size... but its the same as the ID of the vacuum cap. perfect seal!
i think thats it... dont know the velocity, but for a comparison....
before, when i had a leaky stock transfer port, no bored out check valve, and crappy exhaust port, i would shoot an rws hollow point an inch away from a solid piece of alum. it would mushroom out nicely, but nothing spectacular. now, with all the mods finished, i did the same thing and all i found was little flakes of lead, and one tiny solid piece.
needless to say, i think i have enough power now...................... unless theres something else i can do!
i was thinking of a longer pump stroke... not sure how id do that though. anybody got some ideas on that one? really all i'd need is a longer tube. the rest is leverage 101...
i guess i COULD do with some more 
