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The fine thread found on the 1928 barrels are for a Colt blank firing device used with wood tipped blank rounds, the head space notches are for the coil spring loaded keeper on the barrel extension.

Mark
 

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You can find photo and line drawing on page 27 of "Colt Automatic Machine Guns and Rifles" printed by Class Three Ordnance Fairfax, VA 703-378-9464 with out a doubt the finest book you can get on Colt machine guns. Rick from BMG Parts had them for sale, give him a call.


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