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there is a guide to locking pieces here: Guide to HK Locking Pieces

barrel threading on the rifles should be 15x1 RH, and the MP5-40 was not generally a civilian offering in the US, and I've seen a few different pitches as well as 3-lug's on the MP5 10/40's. Factory pitch would be 14X.75 RH.
 

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PDW HK barrels are 1/2 x 32 after market offers both threads.
 
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