Azslim: My nephews Browning A bolt was the same way. It also has a boss on it. What I used for ear plugs. Actually, I was caought off guard when I was asked if I wanted to go with them. I was using cigarette butts for ear plugs. Old Army trick. It works. Anyway, The recoil was very confortable. Felt kinda like my 22-250. Noise level wan't real bad. Even though I was using cigarette butts.