soft-solder

The aluminum-compatible design reduces radial solder strain by approximately an order of magnitude over contemporary soft-soldered feedthrough seals.

However, these chemicals are often too harsh to use with soft-soldered shotgun barrels and ribs.

Care must be taken not to overheat the steel, since many older firearms have soft-soldered ribs, sights, and barrels.

Any shotgun barrel, new of used, other than soft-soldered double barrels, can be cryogenically treated and improved.