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MP40 bolt and tube diameters
Weaponeer Forums : MP40

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Joined: March 13 2015
Location: United States
Posts: 149
Posted: February 27 2017 at 8:16pm | IP Logged Quote vintagemx0

Does anyone have an actual measurement of the OD of the bolt of the MP40 and/or the ID of the receiver tube? The few drawings I could fine cite the OD of the tube as 41mm, but do not indicate wall thickness. I could find no references to the actual bolt diameter. I'm planning on a build that I will apply for an NFA sbr and am looking at using a tube with an ID of 33.25 mm and am worried if this would fulfill the requirement of being "substantially smaller" than the original in the ATF ' point of view.
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