Adapter assembly or other mounting features for closed emitter optic sight

An optic sight installable on a firearm assembly using a retaining assembly, the retaining assembly including at least two retaining parts, at least one of which includes terminal ends and a length in which the length defines a rotatable drive interface, the optic sight comprising:

• a pocket defined by a body of the optic sight;
• and
• the pocket capable of receiving a portion of the retaining assembly in a partially assembled state, and allowing rotation of the received portion of the retaining assembly;
• wherein, while the received portion of the retaining assembly is within the pocket, the rotatable drive interface is usable for securing the optic sight on the firearm assembly or the adapter.

An article comprising an optic sight, an adapter for mounting the optic sight on a firearm assembly, or a part of the firearm assembly on which the optic sight is mountable, the article usable with a retaining assembly including at least two retaining parts, at least one of which includes terminal ends and a length in which the length defines a rotatable drive interface, the article comprising:

• a pocket in the case that the article comprises an optic sight, or a slot in the case that the article comprises the adapter or said part;
• and
• the pocket capable of receiving a first portion of the retaining assembly in a partially assembled state, and allowing rotation of the received first portion of the retaining assembly;
• the slot capable of receiving a second different portion of the retaining assembly in a partially assembled state, and preventing rotation of the received second portion of the retaining assembly;
• wherein, while the received first portion of the retaining assembly is within the pocket or the received second portion of the retaining assembly is within the slot, the rotatable drive interface is usable for securing the optic sight on the firearm assembly or the adapter.