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

A firearm having a magazine well for receiving a portion of a magazine comprising:

• a cavity for receiving the portion of the magazine, the cavity having an input end and a second end opposite the input end, the cavity having a cavity depth extending between the input end and the second end, the cavity further comprising;
• first and second opposing inner walls spaced a first distance apart, the first distance defining a first cavity cross-sectional dimension;
• third and fourth opposing inner walls spaced a second distance apart, the second distance defining a second cavity cross-sectional dimension;
• wherein the first and second inner walls each abut the third and fourth inner walls along edges thereof;
• and
• a channel located on or formed within the fourth wall of the cavity, and the channel extending from the input end to the second end so as to have a channel length, wherein the channel includes a first channel side wall and an opposing second channel side wall defining the channel therebetween, wherein the channel includes a first channel portion extending from a first channel portion end at the input end of the channel to a first channel portion second end, the first channel portion second end abutting a second channel portion at a second channel portion first end, the second channel portion extending from the second channel portion first end to a second channel portion second end proximal to the second end of the cavity, wherein the first channel portion has a varying channel width defined between the first channel side wall and the second channel side wall, the varying channel width narrowing from the first channel portion first end to the first channel portion second end, and wherein the second channel portion has an unvarying width defined between the first channel side wall and the second channel side wall.

A magazine well for receiving a portion of a firearm magazine comprising:

• a cavity for receiving the portion of the magazine, the cavity having an input end and a second end opposite the input end, and a cavity depth extending between the input end and the second end, the cavity further comprising:
• a first inner wall and an opposing second inner wall defining a first cavity cross-sectional dimension;
• a third inner wall and apposing fourth inner wall defining a second cavity cross-sectional dimension;
• wherein the first and second inner walls each abut the third and fourth inner walls along edges thereof;
• and
• a channel in the fourth wall of the cavity and having a first channel side wall, an opposing second channel side wall defining a channel width, and a fifth wall opposing the third inner wall, the channel extending along the cavity depth, wherein the third inner wall and the fifth wall define a section of the cavity with a third cavity cross-sectional dimension that is greater than the second cavity cross-sectional dimension, and wherein the channel has a first channel portion that narrows, wherein the first channel portion channel is wider at a location proximal to the input end of the cavity than at a location proximal to the second end.