I just installed a brake this week for a chap. Had to strip the rifle down to barrel and receiver, then use a mandrel in the four jaw chuck to hold the receiver. Dialed in on the barrel shank, muzzle was on the live center. Cut the threads, set up the barrelled receiver again, crowned the muzzle. Reassembled the rifle. Took about 2 1/2 hours, with the fooling around, the barrel not being readily detachable. Starting with a stripped barrel, a lot less time would be required, probably a half to three quarters of an hour. Start at $50, maybe go up a bit more. Plus the round trip postage. Going to scare $100, maybe more.