AA9130 - A drop-in fit next-generation detachable magazine stock. Constructed of a proprietary carbon-fiber filled polymer for the classic Mosin-Nagant M1891 rifle. The stock fits most M1891 rifles including the 91/30 M-38 M-44 Chinese T-53 carbines in both hex and round receivers. The stock will fit the Finnish M-39 rifles and carbines with some modification. Detachable magazine included.