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In page AK-102:

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Compared to the AK-101 and AK-103, which are full-size rifles of similar design, the AK-102, 104, and 105 feature shortened barrels that make them a middle ground between a full rifle and the more compact AKS-74U. Whereas the AK-10x rifles have longer barrels, full-length gas pistons, and solid, side-folding polymer stocks, the AKS-74U is shorter, and features a skeleton stock.[1]