buffer tube on Norinco M4 commercial size or milspec?

malenurse

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I tried to fit a commercial Magpul CTR buttstock on and it didn't fit- I want to assume that it therefore is a milspec but want to be sure- is it milspec or out of spec?
 
A commercial stock will fit on either tube (very sloppy on a milspec tube). So either you actually have a milspec stock or the Norc tube is horribly out of spec.
 
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