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UMP stock and HDPS Stock Block B

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Anyone have issues fitting the factory UMP stock to the HDPS block B? I just picked up both and the hinge on the stock is slightly taller than the hinge gap on the aluminum block. I know I can file the stock hinge, but wanted to know if this is normal. TIA.
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It's been years but I recall having to sand my ump or g36c stock just slightly to get it to fit. They are both still somewhat firm on open and closing. I definitely appreciate the resistance as they won't open accidentally.
 
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