On Sale Add to Cart Compare Uncle Mike's Hammer Extension, For HR Topper and Ruger Blackhawk, Black 2456-0, UPC : 043699245604 Uncle Mike's MSRP: $9.97 Now: $6.62 Was: $9.95 Fits: Ruger Blackhawk, HR Topper, New England Firearms Handi Rifle. MSRP: $9.97 Now: $6.62 Was: $9.95 Add to Cart Compare