How does one get new bbls for the Rem 7600 pump? Since the bolt engages the barrel and not the receiver, there is not headspace problem, and removal requires only a drift punch. The problem is getting a barrel that fits this specific mounting arrangement.

Contact Remington Arms Corporation.

Sabot,
The Remington 7600 barrel assembly has a recoil bracket and a barrel extension. The bolt locks into the barrel extension. The barrel extension is threaded on to the barrel and retains the recoil bracket against the shoulder on the barrel.
Headache