i was just wondering what if any, slip on recoil reducer will fit my slug gun. its a synthetic stocked, 12 gauge on the sb1 reciever. not sure if its a ultra slug hunter, or what model it is, just a basic H&R with a basic stock. im looking for a slip on so i can increase the LOP, as well as recoil reduction. i checked the FAQs, but couldnt find what im looking for. i know limbsaver makes 3 sizes, just dont know which.