i looked at that stuff yesterday....they mention double guns and i emailed them to see if that stuff works in an H+R shotgun.....wondering how the ejector would work....this stuff definately looks interesting. they have a 32 H+R insert for a 20 gauge.....218 Bee for a 12 gauge.....45 ACP for a 12 gauge...they come @ 10 " long,18" long....interesting stuff. I'm looking for some reviews on these products