Not sure if its because I have recently returned to the forum, but you seem to make a lot of guns. They are inspiring works of art, from reading your theads am I correct in thinking all your metal shaping and 'machining' is all done without the use of a milling machine? If so you must be incredibaly...

I am interested in constructing a valve similar to yours, the T piece that the piston is located in, does this have a ported tube lining the T or is the T fitting smooth on the inside? Also the O rings on your piston, how tight are the O rings on the piston, are the grooves wider than the O rings an...