I bought this gun here a couple of years ago from smalljawbasser, I never did ask him if the brake was from Kimber or not. It looks like a factory setup.

Also appears that the barrel wasn't shortened at all, rather just the crown was threaded.
Gun weighed 5lbs 1.5 ounces before t/g and Ti bolt handle...so about 3oz were saved.
Balance is quite good.