Sorry to start another Glock thread. But I've been wanting to get a Glock 20 for a long time, finally picked one up, a gen 4. I'm planning on trying some of Underwood's 200gr hard cast ammo. I'd like to use it as a woods carry gun. Browsing a bunch of forum archives, there's a lot of conflicting opinions online about this setup. I would like to keep the gun factory stock and not go the aftermarket barrel route. Some say upgrade the recoil spring, but that seems to apply more to the Gen3 and earlier Glocks with the single spring. Anybody try this setup with Underwood's current hard cast ammo with a Gen 4 Glock 20 with factory RSA and factory barrel and mag springs? Once I get the ammo and the gun (stupid 10 day waiting period) I'll take them to the range to function test. But I'd still like to hear anybody else's experience.