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Barrel Contour Differences


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Excuse my ignorance but I'm still kinda new to all this Thompson stuff.

 

Anyway, what are the contour differences between the current semi-auto TM1 16.5" barrel and the TSMG M1/M1A 10.5" barrel that would require a different forend?

 

Can anyone post a pic of the two barrels side by side?

 

Still getting my ducks in a row here before I SBR my TM1...

 

 

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