Originally Posted by pwpaintball
If I'm not mistaken the V/A was an aftermarket part. The way it works is there is a ball bearing in the bore of the hammer, and the screw out the side has a taper to it. When you turn the screw in the ball gets pushed backwards and increasing the spring tension. Which in turns keeps the valve open longer.
That is all correct. These velocity adjusters work but don't seem to offer the same range of adjustability as the rear velocity adjusters do.