Mediocre workmanship, does not hold a setting without set screw tightened
Supposedly, the Dead On Paintball RVA is a great upgrade for any tippman owner who wants to be able to adjust the velocity of his marker without the hassle of using an allen wrench. I agree, it is a great upgrade, but don't expect to dodge the wrench. The tension screw in this RVA will slowly unscrew as the gun is fired, due to the vibration and tension of the hammer spring. Thus, your velocity will be decreasing as you shoot. To keep your setting you have to tighten the set screw (tournament lock in proper PB slang) using an even smaller allen than the standard one. I have tried to put just a little tension on the set screw, still allowing the tension screw to be adjusted, but it still works it's way out. A little Teflon may do the trick, but I have yet to try that. Anyways, part of the problem is that the tolerance between the tension screw and the housing it screws into is not close enough. On mine it even wobbles slightly. I wake at night in a cold sweat from nightmares of it unscrewing completely and getting lost in the heat of battle, with total newbs flanking me. Okay, maybe not, but you get the picture. The housing swivels, which I guess is supposed to remedy this, but it doesn't work and only makes one handed adjustments more difficult. The design is okay, but DOP really needs to up the quality of workmanship in their products. That being said, it does do its job (more or less) and will help you conserve air, so it might be worth the stress.
Works okay and helps save air, but don't expect to be able to leave your allens at home. If you want to be able to adjust velocities in mid-game, get something from a more quality-oriented company.