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Bought this for a Rock Island bbr 310. The extension fits the magazine. Just fine, but when you put the magazine into the gun, the back clip securing The floor plate gets disengaged by the frame of the gun. To fix this, I drilled a hole in the extension in the same place as the original design Cut off the back clip with the dremmel. Then it worked just fine. If ur Not ready to do some work. Do not buy this for the Rock Island BBR
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