LANTAC Lamprey Plan-B Hub Mount Flash Hider LAM556FH-PBSManufactured to the highest quality standards and featuring a patented design the LANTAC LAM556FH-PBS Flash Hider offers improved signature reduction over competitors products.Its unique 'toothed' four tine design disrupts gas more efficiently and reduces flash intensity and duration. Shooters can now enjoy advanced weapon control with the ability to mount the Plan-B HUB.Lamprey Flash Hyders are precision manufactured on Swiss lathes and machined from AISI4140 steel that is then hardened to 55Rc (Rockwell C approx) and QPQ (Quench Polish Quench) Nitrided to AMS2753D standards for extreme use enhanced corrosion resistance and improved lifespan.The mount design is not Licensed from Q and therefore suppressor warrantly will be effected.Ships with timing shim set.Users should follow shooting guidance for the Plan-B HUB as supplied by Q LLC and others.Lantac recommends the use of semi-permanent thread locker Rocksett sold separately.SPECIFICATION: Caliber: .223 / 5.56mm Material: AISI4140 Hardened 48-52Rc Dimensions: L: 1.750'' MOUNT DIAM: 0.900''. Weight: TBC Thread: 1/2-28 to Plan-B Serial Numbered for Quality Control Comes with appropriate timing shim set. Made in the USA.