Yeah, I love the mech one. It feels so good to shoot, because the action right now is like a cocker, you hold down the trigger the bolt stays forward. Well, it shoots forward then pulls back about .2", trapping air in the dump chamber. Part of the design so it won't have any velocity issues and to save some wasted air.
I most likely will put a pulse valve on there, but I kinda like it how it is. I plan to play with it in some games in the future, the test 'mule' just because it is retro looking and fun.
Still a ways out though, I wouldn't hold my breath.