If you're on the fence about getting one for your FX, jump off and run to your nearest dealer. I was truly skeptical about the benefits. But I figured for the price of a couple of tins of pellets, it was worth a shot. At least in "my"gun it seems to be working great. The groups have tightened up and I'm not getting the same amount of flyers as before. It's not as stiff after installation as I thought it would be though. And as we always say on the forums, "your mileage may vary" so please keep that in mind. But I think it's worth the investment.
Keith.
Keith.