I will be running a similar build. My Z-Parts 13.5" MK16 Handguard will be here tomorrow. Currently I have a Z-Parts 10.5" MK16 Handguard on my MWS. It is only hand tightened as I am waiting for a wrench. I have about an 1/8" gap between my upper receiver and my Mk16 at the picatinny rail, will this go away once I tighten with the wrench?