Quick disconnect sling mount for a firearm

A handguard for a long gun, comprising:

• a quick disconnect assembly for a sling, comprising:
• a cup having first end portion defining a through opening and a cylindrical body portion connected to and extending axially from the first end portion to a second end, the first end portion and the cylindrical body portion defining a through-opening axially through the first end portion and the cylindrical body portion, the through-opening having a cross-sectional shape of a circular region intersecting an elongated slot, the cup further defining a recess extending axially part way into the cylindrical body portion from the second end, the recess having a slot shape oriented transversely to the elongated slot of the through-opening;
• a post extending axially between a first end portion and a second end, the first end portion of the post having a protrusion extending laterally outward, wherein the post is configured to pass through the through-opening when the post is in an unlocked position and the protrusion is configured to be received in the recess when the post is in a locked position;
• an attachment point connected to the second end of the post;
• a spring on the post between the attachment point and the cup;
• and
• a receptacle secured to the handguard, the receptacle defining a threaded opening configured to threadingly engage the cylindrical body portion of the cup.

An adjustable stock for a long gun, comprising:

• a quick disconnect assembly for a sling, comprising:
• a cup having first end portion defining a through opening and a cylindrical body portion connected to and extending axially from the first end portion to an open second end, the first end portion and the cylindrical body portion defining a non-circular through-opening, and the cylindrical body portion defining a recess extending axially part way into the cylindrical body portion from the open second end, wherein the cylindrical body portion is threaded;
• a post extending axially between a first end portion and a second end, the first end portion of the post having one or more protrusions, wherein the first end portion of the post is configured to pass through the non-circular through-opening in the cup when the post is in a first rotational position and wherein the one or more protrusions are configured to be received in the recess when the post is in a second rotational position;
• an attachment point on the second end of the post;
• a spring on the post between the attachment point and the cup;
• and
• a receptacle secured to the adjustable stock, the receptacle defining a threaded opening configured to threadingly engage the cylindrical body portion.