Did a thorough clean. Let boretech C4 soak in the neck/freebore area for 24+ hours. Scrubbed with 6.5 nylon brush. Patched out. Used simichrome to scrub freebore area. Cleaned with bore tech c4 again.
Used boretech copper on wet patches. Let it soak for an hour. Scrubber with nylon 6.5 brush...