HELP-crosman 1377 pistol problem

[Jethro]

Crosman 1377 docs:
http://www.crosman.com/2004/pdf/manuals/crosman/1377/

Good forum for all things Crosman:
http://www.network54.com/Forum/275684/

1377 disassembled:
http://i297.photobucket.com/albums/m...sassembled.jpg
(not my picture but from a quite useful Russian site:
http://translate.google.com/translat...24/254657.html)

Cut-away diagram:
http://i297.photobucket.com/albums/m...ayandwhole.jpg
(again, not mine but acquired through the above Crosman site)

And, in case you haven't been there:
http://airgunartisans.com/
pages and pages of modified Crosmans to oggle.

[T 20]

I keep looking at the 14" barrel and custom breach I've bought, and it's occured to me that fitting this setup to a standard length 1322 pump tube would be a bit of a missed opportunity. I actually like the standard Crosman front sight, so why not use the 14" barrel and make a new longer pump tube to suit it. Most people fit a 14" barrel to a 13xx and then fit a barrel weight to it so why not just extend the pump for the extra weight and use the original foresight? If I did this the gun would only be 17.5" long and would still weigh less than a scorpion, with a weaker hammer spring I would have multishot capability at sub 6 ftlb velocities on each pumping.
If anyone has an old 13xx or 22xx as a donor give me a shout as I will need a triger assembly, I'll be a bit busy for a day or two, and I may get my 140 finished one day, but I think this idea is worth having a bash at.
Any comments ?
Cheers Mick