I'm currently working on this kind of pump action shotgun, I think I can call this the final release, however, its a bit unstable at times, might be due to Algodoo's collision detection, and the fact that im using 1.9.5b. but is better then older versions, also i just need to tweak some stuff, after this final release, I'll see what i can do for later times.
NOTE! Remember to pull out the safety pin, and i suggest putting it back when you reload!
Happy shooting!
UPDATE 12/14 - 2012
I decided to use some new technology from my MLChain weapon, which caused me to rebuild MLPumps reload mechanism. So now, the gun is much more stable, and shouldn't have much problems with quick pulling anymore.
Thanks for reading!