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Choate M1 + 2 wont fit M3


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Ok, yesterday I received the Choate M1 +2 extension and it wont thread onto any part of my M3. I searched a lot of forums and most said that M1 and 2 extensions were compatible. I don't understand how it could be so hard to make a metal tube that threads into the existing nut. Choate's isn't even a tube it is crudely rolled metal that is apoxyied into a nut that won't fit the threads of the existing nut. they don't even let you use an existing mag spring retainer on the end of the tube, they melt a plastic on into the end. So with that said Choate is off my list, and now I would like to know if anyone has any experience with an extension tube that will actually thread into the existing nut on an M3. Secondly does anyone own both a M1 and a M3 and tried to swap parts?

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TY for the fast reply.


Does The Sure Cycle extension have the (I'm not sure the proper term) little ball that clicks into the depressions on the sling attachment/spacer that is already on the M3?


Is there some patent or other legal issue that keeps the after market makers from using the threading on the existing nut?

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