I ordered two of these two weeks ago and they just arrived. RAD1a....same price as a Gracoil but instead of an internal spring it operates on a sealed hydraulic fluid cylinder. The consensus on trapshooters.com is that these are a nicer unit than the Gracoil. I've had Gracoils and no complaints but decided to try these this time around. Pre-drilled and threaded with all included hardware to fit a kick-eez pad. These also have the bonus of being a single external adjustment for all the adjustments on them. You do not need to remove the pad to make all the adjustments you want like you do with a Gracoil. I put the pad on for the pic. I'll post pics once they are installed on my guns.