Hi,
Your rig is very similar to mine. I have a 7-1/2" barrel, a 2X Burris scope, and a Pistol Packaging bandoleer holster. I have the same Hogue grips. Mine's a .480 Ruger. Is yours, or is yours a .454?
Where did you get the hammer extension?
Did it have to be mounted by a gunsmith, or is a do-it-yourself sort of thing?
Good luck on your hunt!