There were two makers that know of for the hammer extention. Because of some safety litgation, they discontinued manufacture of them. I see that someone has resumed manufacture but don' remember who it was. I use them on my Savage, NEF Handygun, and Contender. Check the parts counter in Cabela's, Bass Pro, and Sportsmans Warehouse. You might ck some of the smaller shops or gunsmiths. Good luck.