Patent ID: 9062924
Filing Date: 2015-06-23
Classification: F41A

Abstract:
1. An ammunition magazine for providing one or more rounds to a firearm, said magazine comprising: a rigid housing having a bottom housing wall and front, rear, first side, and second side housing walls defining both an ammunition cavity therebetween and an ammunition aperture at an upper part of said housing, the ammunition aperture having an aperture size sufficient for each of the one or more rounds to pass therethrough; a rigid follower, disposed within the ammunition cavity, and including a main body having an upwardly facing alignment structure and at least one follower wall defining at least in part at least one extension spring cavity; a first constant force extension spring, disposed within the at least one extension spring cavity, and having a first spring active end fixed to an upper portion of said housing, said first constant force extension spring being oriented to unroll along one of the front housing wall and the rear housing wall; and a second spring disposed between said follower and the bottom housing wall; wherein said first constant force extension spring and said second spring bias said follower towards the upper part, and said second spring is a compression spring.