Sounds like the manufacturer is primarily warning due to potential injuries to you if the bullet comes apart and shoots out the port, not so much damage to the gun.
I've not seen that warning before. If you were to shoot it, make sure you have good eye protection.
I have a 21C and recently acquired a non-ported barrel to use sometimes. Glockmeister fixed me up with that. If you decide to add a non-ported barrel to your collection, you could save the ammo for later.
I've not seen that warning before. If you were to shoot it, make sure you have good eye protection.
I have a 21C and recently acquired a non-ported barrel to use sometimes. Glockmeister fixed me up with that. If you decide to add a non-ported barrel to your collection, you could save the ammo for later.