Geissele 12.6" MK20 Dual Tab Black Handguard Assembly 05-2555B splits the difference between the featherweight 9.6" MK20 and the full-length 15" - enough real estate for most accessory setups without the extra couple ounces the longer option carries. The whole rail is built around aggressive material removal in the non-structural areas, which is what gets a 7000-series aluminum handguard down into this weight class without turning it flimsy. Geissele backs that up by rating the rigidity "Super Stiff" internally, and the dual anti-rotation tab clamp system - locking onto the included proprietary barrel nut - is what actually delivers on that claim under recoil. A continuous Picatinny rail runs the 12 o'clock position, with M-LOK slots at 3, 6, and 9 for lights, grips, and whatever else needs mounting. At 9.7 ounces bare and 11.4 with the barrel nut, this Geissele MK20 stays noticeably lighter than most 12+ inch handguards on the market while still holding zero under hard use - the whole point of a skeletonized design done right instead of just marketed that way. Key Features: 12.6" free-float length, full-length Picatinny top rail M-LOK slots at 3, 6, 9 o'clock 7000-series aluminum, skeletonized design Dual anti-rotation tab clamp system Height 2.388", inner diameter 1.36", outer diameter 1.59" Weight: 9.7 oz bare, 11.4 oz w/ barrel nut Black finish Fits mil-spec AR-15 upper receivers This Geissele Handguard hands builders a genuine middle-ground option - real mounting length without tipping into the weight penalty longer rails usually bring. Geissele 12.6" MK20 Dual Tab Black Handguard Assembly 05-2555B