Automatic weapon magazine, charging handle, bolt carrier, bolt catch, scope, and bolt features and methods of operation

A charging handle for a firearm, comprising:

• a front end and a rear end;
• a body extending from the front end to the rear end;
• a crossbar disposed at the front end, the crossbar having a bottom surface defining a horizontal plane;
• and
• a latch being operatively connected to the body,
• wherein the latch extends below the horizontal plane.

A bolt carrier for a firearm, comprising:

• a front end and a rear end;
• a main body extending from the front end to the rear end;
• an indented portion;
• a pair of vent holes disposed in the indented portion and aligned such that a horizontal line passes through each of the vent holes, wherein the horizontal line divides the indented portion into a first portion on a side of the horizontal line closer to the front end and a second portion on a side of the horizontal line closer to the rear end;
• and
• at least one additional vent hole disposed on the first portion of the indented portion.

A scope assembly for a firearm comprising:

• a main body having a cylindrical portion;
• a lens disposed within the main body;
• a power adjuster, an elevation adjuster, and a windage adjuster, each coupled to the main body;
• a mount for mounting the main body to the firearm;
• and
• at least one marker disposed on a surface on the main body and at least one marker disposed on a surface of the mount,
• wherein the at least one marker disposed on the main body and the at least one marker disposed on the mount correspond to the same radial position on the respective surfaces.

A bolt for a firearm, comprising:

• a front end and a rear end;
• a main body extending from the front end to the rear end;
• a tail portion disposed at the rear end;
• a plurality of lugs disposed on the main body at the front end;
• and
• a plurality of ribs disposed on the main body and extending from the front end toward the tail portion.