Hey guys, I'm looking to fake up a reactive trigger for a blowback semi. I'm getting bored, and it seems like it would be a pretty cheap hobby project. I would like to model it after the Tippmann kits, but on a PMI Piranha blowback gun. I'm thinking that I'd need to tap the gas that is used to blow back the bolt and hammer to also kick the trigger forward(although a little later in the cycle, as to prevent it from either not recocking, chopping a ball because it didn't cycle far enough back, or being just plain unreliable).
I whipped up a fast diagram of what I'm looking to do. It's a little big, sorry if I toast someone's dial up
The farthest left red arrow points to the hole for the valve retaining screw. The second red arrow points to an unthreaded hole, which I assume is a vent for gas after it's been used to throw the bolt and hammer back. I'd like to thread, and then plug this second hole. The green range represents where I'd like to drill and thread a hole for a 90* barb to run to the grip piston. The represents the area where I would like to drill a new vent hole(since I plan on sticking a grub screw in the other one.
I am going on the assumption that I have to have a vent hole(so the internals of the thing don't end up impacting on my mask after they fly out the back, or at least break), and that I could control the reactivity of the trigger by opening a valve inline of the air feeding to the piston.
Any input on where looks like a good point to place the vent and barb holes would be appreciated. Keep in mind that I don't expect this gun to be efficient, consistant(well, it'd be nice to be able to chrono with it), just be something fun to modify, that would still be useable afterwards.
I'm also looking for parts canidates I could use, from McMaster, or another online source. Pretty much the spring return(I think) piston, and barb/valve options.
Thanks for your time.
After a little more consideration, I decided to star out the image so you could look at it if you want to, it's frickin huge, and starring it was easier than resizing.