A firearm magazine assembly includes a magazine body and a feed-lip component. The magazine body has a longitudinal axis and a surrounding wall defining an interior volume. The surrounding wall extends, in a direction substantially parallel to the longitudinal axis, from a proximate end opening of the magazine body to a distal end opening of the magazine body. The feed-lip component is attachable to the proximate end opening. The magazine body is formed of a continuous fiber reinforced polymer composite and can be made by pultrusion or pullwinding.