hmm I can't open that links..
maybe he used the word 'gas ram' to explain the concept of a partially balanced spool valve ?
well anyway... it would be cool if someone could contact him and ask him some questions
have you noticed that he mentions ether there ? I wonder if it works with pneumatic guns.. if it does then it wouldn't be that difficult to design a device that will meter and release a small amount of it just behind the projectile for each shot
I made a mini gun yesterday. It's 4 inches long and has a carved balsa stock
with a bit of telescopic tubing to act as a bolt i'll post a pick when the cameras battery is charged.
that is a really nice find there, i didnt know he did a video on how to do this.
i think this can be done by fixing a common scouring pad or slightly more abrasive material (like steel wool) to the end of a wooden dowel, and running it like in the video. I will defiantly try this out on something, it has a very nice result.
that was a typo
im more of Submanchine gun type person and asfor the assult rifles I like the M4 best 
