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Sorry to go further off subject but have you ever thought about some kind of tooless/quick detach barrel clamp system using a locking latch or latches similar to the one in the image? Could have the latch or latches on one side and picatinny accessory rail on the other, then sling mount on the front or rear like the MCS barrel clamp. Not sure if it's a feasible idea but it would be a nice addition to the MCS system for quick barrel swaps. Just don't know if a design like this can be locked down tight enough to handle the recoil though..?