Ibi 2 gill brake for trade

Ibi 2 gill muzzle brake 1/2-28 threads, will accommodate up to 9mm, self timing and brand new never installed. Want to trade for a muzzle brake with 5/8-24 threads also self timing for 6mm, 7mm or 30cal of comparable value. Will add cash for the right brake. Will also sell for $140. Radial muzzle brakes will not be considered