You can use a Xvalve, but you gain no advantage except weight. The Xvalve is designed for faster recharge, which won't be a problem on a pump gun, so that speed advantage will be wasted at greater dollar cost.
Originally Posted by Chonky
The level 10 doesn't work well on a pump mag. The wave spring holds the bolt forward to prevent it from allowing the sear to reset. One a level 7 mag, the back of the bolt stem still sits against the powertube oring to seal the front chamber and prevent the residual air from escaping. A level 10 bolt has a vent hole. If it isn't allowed to reset, the vent hole will be in front of the carrier oring which will allow the residual air to escape out through the vent hole. The gun will still work, but it won't be as air efficient and will allways seem to have a leak until you cock it.
Except for the Automag in front, its usually the man behind the equipment that counts.