Quote Originally Posted by Benelli B76 View Post
Polyurethane elastomer seals are by far the best. Having "memory" resilience they can take a pounding and keep their shape. I make my own on a lathe and seen old rifles improve after fitting replacements. Having a thin lip parachute design gives the best results. Most manufacturers today use polyurethane.

Baz

Benelli B76 - Where do you buy the raw material ? Am interested .