why a hole in the piston? i understand the spring part but how would a hole help?

ok so for my next project i want to make a semi auto.I ordered my qev and it is stainless steel :), Im expecting it to arrive next week. Now im still considering a single shot but this might be alot more fun. I want to make a bullpup semi automatic that is magazine fed.I am going to use marbles as a...

thanks! yeah i knew flow would be restricted a bit but it is still very powerful. on my compressor (120 psi 3hp 5 gallon) i can get around 10 fills to 100psi. At 120 psi it can you some damage ill post pics later i also have a scope on it now. As far as ammo goes i use sockets with sabots or wadding...

i have done it i just emptied a oxygen tank drilled it out and tapped the threads in the hole i drilled for 1/4 in threading screwed in a 1/4'' nipple then put a bunch of epoxy around it to permanently keep it there because my tapping skills are very ghetto when i dont have a kit

AMR-1 anti material rifle 1 well im posting a air cannon finally. video will be up soon but for now here is a pic but first ill give some details. It has a 3/4in barrel about 4ft long and an air chamber 1 1/2 in in diameter and about 1 1/2 ft long. This design is similar to STUFFBUILDERs and his can...

i should have bought one of those.... well now to pick up an adapter.

Well my shock pump arrived around a week ago and im buying a qev maybe two today as well.The problem i am having with the shock pump is that i cant use it for spudding! I say that because i cant thread anything onto it to fill anything with. it has threads a little smaller than 1/8'' on it here are ...

whats kinda range you getting from it?

very nice! what did you use for the barrel? it looks like 3/4 schedule 40

ok thanks, im going to use the fiberglass rods. as far as a trigger mechanism goes what do you recommend i have a few ideas in mind.

sorry to bring back this old thread i forgot about it :oops: anyway i have multiple fiberglass rods in my basement and garage. However they arent too thick there about the width of a bic pen. i was wondering if i were to somehow quadruple them up would that work? i need something fun to do because m...

very nice and a clean piston too.

im just ordering one in the us from ebay i just ordered a shock pump and ammo and am buying the qev later today.

ahh my stupidity got the best of me :x i should have searched better. anyway.... so i assume its safe to use at 200 psi max? assuming it cracks at 250psi? so now that i kno that id rather get the qev ill buy one right now but if i do so that leaves me enough for a 300 psi shock pump instead of a 400...

jsr i once again require assistance lol ok so im not going to buy a qev because i did research and basically a brad nailer is a piston valve and i have a nailer that i am not using. its just like this but gray and made by true power(got it for 10$ new) http://menards.com/main/tools-hardware/power-to...