The nuts tightened securely and haven't come loose yet. This 1/2 inch riser fit perfectly and has worked well. I've put a hundred rounds or so and the rail is. ARES PICATINNY RAIL RISER OR BASE M-LOK ACCESSORY TYPE E. Will not be disappointed with the quality of these risers. Picatinny Standard rail. Attachment and securing. FENTUK 2 Pack 8 Slot Picatinny Riser Mounts - Available in Low Profile and 1 High Profile, Perfectly Meeting Your Different Needs! Riser Base Mounting. Disponibilidad: 6 artículo(s) ; SKU: Base_montura_Fyland_Picatinny_o_ Tactical 1 inch High Profile Short Riser Mount Matte Black Picatinny 8 Slot Alto de 1". . They secure tightly to a standard picatinny rail. JS TACTICAL 1" ( cm) 8 SLOT WEAVER RAIL RISER. : [HOST]: Perfil bajo in Extensión Riser Riser Rail Mount Picatinny/Dovetail 9 Ranuras Montaje Rail Top in in Base de montaje de ancho. They secure tightly to a standard picatinny rail. ARES / AMOEBA MP RISER HEIGHT RAIL MOUNT 8 SLOT BLACK Arsenal Sports · MP · Ref. Flat top " inch See Through Riser Scope Rail Mount 8 slot Picatinny Weaver Designed for elevating scopes, sights, flashlights, etc. This is flat top standard picatinny riser,% solid Aluminum. These risers are % solid Aluminum.