well other than an exercise in engineering there really is no valid reason for such a piece. other than cool ness and the fact i want one
but yea even in a military application such a thing isnt useful. cavilian even less. but i also dont see why we should be banned from having them.
and i didnt know it was in .40....thought the only one was the 18 and i thought it was 9mm....then again i dont know crap about glock model numbers