Originally Posted by nerdcore
Agreed, try to find one already converted to pump. If not, the cheapest pump kits for a trilogy is $30 shipped new off ebay. Installation is a breeze but removing the pneumatics TO install it can be a beast, especially the loctited ram. I've converted 3 trilogys, and the ram removals always give me problems.
Try to find a Pro or Competition version. The most common, the Sport (usually blue), is the cheapest but the stock valve only works properly with co2 - if you use air, you'll have problems getting the velocity above 250.
What if we already have a sport, is there some kind of valve kit to get it to use air?