I bought this piece a few months ago for a planned MK18 build but have since shelved that project. The can built tough but is hollow and can’t be opened (at least to my knowledge) to add a tracer unit. It comes with an SF-style 4-prong, 14ccw steel flash hider which can be secured firmly by a grub screw. The can is QD via a surefire-style locking ring and ratchets down on the flashider. Sadly this can does not have SF markings. This item is perfect for an air softer/milsimer looking to clone screen/photo accurate MK18, URGI 10.5, FN SCAR MK16, Devgru N4, KAC SR-16, or L119A2. And with supply chains still screwed up from COVID, theres no better time to finish that airsoft gun build you’re working on. Buyer pays shipping