Patent ID: 9207028
Filing Date: 2015-12-08
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 abutment defining at least in part first and second extension spring cavities; a first constant force extension spring, disposed within the first 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 constant force extension spring, disposed within the second extension spring cavity, and having a second spring active end fixed to another upper portion of said housing, said second constant force extension spring being oriented to unroll along the other of the front housing wall and the rear housing wall; wherein said first and second constant force extension springs bias said follower towards the upper part, and the at least one follower abutment separates the first and second extension spring cavities.