A customer requested a fix for a BRN-180™ issue that he had discovered. The rubber bumper (that the stock folds into) screw can come loose if not loc-tit'ed in place, and if overtightened, the screw can penetrate into the action through the steel bolt guide rail that it screws into, damaging the bolt.
These solid Nylon Bumpers give a positive stop for the screw once tightened down all the way. Available in multiple sizes depending on if your folding stock needs a bit more material to land on, or needs a thinner one to fold closed correctly. Some users prefer thinner design because they don't like feeling something else when hitting the bolt release with the palm.
Replica: .50" diameter, .30" thick.
Shorty: .50" diameter, .18" thick. (personal fav)
Tall Thin: .20" higher toward the rail, but only .18" thick.
Tall Thick: .20" higher toward the rail, but .30" thick.
To humor Murphy and the gods of war and chaos, we recommend you add blue loc-tite to the threads after cleaning the factory female threads. -Loc tite not supplied- Just make it snug, and check the inside to ensure no over-penetration.