[FlyVet]

The laws of physics state that every action has an equal and oposite reaction, so how can they have less recoil than other firearms using the same bullet!

Maybe because of perceived recoil, rather than real recoil. The Glock's slide is very heavy, I think 80% of the gun's weight. I've tried a Browning Hi-Power too, and though it's heavier, I think it has more recoil than the Glock. I have the model 17, and the recoil is very manageable with the hottest handloads. For instance, a gas-operated shotgun has the same amount of recoil as a pump, but it's stretched out over a longer time period.

[mvpel]

You're using handloads in a Glock? Shame shame...

The reason that they say to always use factory ammo is that Glock chambers are a bit on the loose side to allow reliable feeding, and reloaded ammo can wind up popping in the wrong direction.

[mvpel]

Here's the Glock kB! FAQ:

http://www.f-r-i.com/glock/FAQ/FAQ-kb.htm#6