Externally loading semi-automatic firearm with integral or non-removable feeding device

Weapon and rifle systems and methods with integral or non-removable ammunition well or reservoir are described. A lower receiver for an M16 type weapon or rifle system is described with an aperture for loading one or more cartridges into an ammunition well or reservoir formed as part of the lower receiver, a pull channel, a follower pull coupled to the pull channel, a follower adapted for retraction by the follower pull, a bottom cover to the ammunition well or reservoir, wherein the pull channel and follower pull are capable of retracting the follower past the aperture for loading one or more cartridges into the ammunition well or reservoir. Also described is a weapon or rifle system using the lower receiver described herein and a method for loading a weapon or rifle system using the lower receiver as described herein.