Hi....I'm a newbie awaiting delivery of my 6920 this coming week. I have a few technical questions. I'm considering putting a mid length free float rail on it instead of a carbine length RAS. The Knight's mid length is a bit over 9". I presume I'll have to remove the front sight / gas block and replace it with a low profile one. Is removing the old / replacing with a new gas block an easy procedure? Any suggestions regarding manufacturer choices for the new block? I'm planning on putting a set of YHM / Troy / or GG&G BUIS on the top rail when it's installed.
Thanks!


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