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An FN SCAR L with a black push-button QD sling swivel near the butt of the riflestock. Quick detach sling mounts (QD), also called flush cup sling mounts, is another type of sling mounting interface. "QD sling swivel" usually refers to the part attached to the sling, while "flush cup" refer to the corresponding socket on the firearm.
The fixed buttstock also features integral quick-detachable sling swivel sockets located on each side of the stock near the rear of the lower receiver. The addition of a flash hider to the barrel of the M110, which also necessitates a modified QD Suppressor unit similar to that on the Mk 11.
Early prototypes had steel QD sling sockets on both sides of the stock; however, current production versions will have solid steel sling loops on either side. This is to alleviate any damage that may occur to a sling that is mounted on the QD socket, and to reduce the amount of stress taken while carrying the machine gun.
A prototype of the MOE slot was revealed by Magpul in late 2007 together with their Masada Concept Rifle (which would later be known as the Adaptive Combat Rifle).Magpul released the MOE slot system in 2008 as a feature on their MOE handguards, and at the same time compatible accessories such as Picatinny rail sections, direct MOE mounted light mounts, grips, bipod studs, etc. were released.
It is similar in concept to the earlier commercial Weaver rail mount used to mount telescopic sights, but is taller and has wider slots at regular intervals along the entire length. The MIL-STD-1913 locking slot width is 0.206 in (5.23 mm). The spacing of slot centres is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00 mm). [8]
Octal sockets were used to mount other components, particularly electrolytic capacitor assemblies [11] and electrical relays; octal-mount relays are still common. [ 12 ] Most octal tubes following the widespread European designation system have penultimate digit "3" as in ECC34 (full details in the Mullard–Philips tube designation article).