XTS MT-158 FLIP UP TACTICAL FRONT SITE by Xtreme Tactical Sports $24.95 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Quick detachable front sight with adjustable A2\Square Post Assembly to fit all Picatinny/Weaver-style rails Equipped with locking retention thumb nut Clever and Robust Flip-up Posi-lockDesign