cleaning barrel

[shattered00]

When the cleaning rod hits the crown (what is the crown?), what exactly happens that is bad? How would I prevent this from happening?

I clean my AK and all other guns starting with the muzzle side. Is this improper procedure? To date, I have a Winchester Model 70 Pre-64, Romanian SAR-1, Glock 40, Winchester 74, Rem 870, stevens 12 gauge, H&R .22 revolver, and a Western Field Model 410.

By the way, I Use a rod made by Proshot that has 3 separate pieces which screw together if necessary. It is made of aluminum. The brushes are all phos. bronze bristle with a brass core.

 

[Chawbaccer]

The crown is the end of the barrel, the last place the bullet touches as it exits the barrel. Damage here affects accuracy. Use a bore guide to protect the crown from cleaning rod wear. Aluminum oxidizes pretty easy. Grinding wheels are made of aluminum oxide.