Sorry, Wes!! I replied last night, but it never went thru. The place is Wright's Gunsmithing in Pinckneyville, Il. The phone no. is 618-357-8933. You'll have to call and ask Stu about the pricing, but it's very reasonable. I have an XS Skeet that is on it's way there for the conversion. He's done several for me and my customers, all with great results!!
I've put perhaps 15,000 rounds thru my XT with the factory inertia trigger and never had it fail to work properly. I know many other shooters who have put way more rounds through their Browning Citori (same trigger as the XT) with nary a problem.
I don't see the benefit of changing something that is working perfectly well as is. Of course, if you are going to start using your XT to hunt dangerous game such as lions and bears, then perhaps mechanical triggers might make a difference in that one round out of 5,000 that doesn't fire the first time the firing pin hits the primer.
I've fired MANY 7/8 ounce 20 gauge target loads through my 12 gauge XT using my Seminole Chamber Mates and never had a single problem with the inertia trigger.
I know of other guys who use the 12/28 gauge Chamber Mates without a problem. Now if you are planning to go all the way down to the 12/.410 Chamber Mates, then you might consider mechanical triggers. Otherwise, why mess with something that's working well?
This is just my way of looking at things, of course. Others may see it differently.
There are thousands of Brownings with small gauge tube sets(including the .410) that work fine without a mechanical trigger conversion. They do need to have a simple modification done to them.
As stated earlier, the mechanical conversion is just an addition to the sear to bump the inertia block. It does nothing for the trigger pull or feel. Nor does it alleviate the problem some have with letting off the trigger once it's been pulled, to allow the trigger to reset for the second shot.
If you want a clean crisp 3-1/4 to 3-1/2 lb. pull, a trigger job will be needed besides the mechanical rework.