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Discussion Starter #1
Using the factory barrel with the stock folded, what is the total length of the USC/UMP conversion?
 

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Discussion Starter #2
Never mind, Ed from HDPS just replied to an email.

Using the HDPS stock block "B" it's 26 3/4.
 

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Discussion Starter #4
No its 26 3/4 inches using Ed's HDPS stock block "B" and the factory HK barrel or either of his HDPS 16 inch barrels.

The HDSP short barrel is 7.87 inches long which would make the gun shorter by 8.13 inches.

I'm too tired to do the match right now. 26 3/4 and subtract 8.13 inches for your over all.

If using his short barrel its an SBR.

Even if the over all length WAS 26 3/4 inches with his short barrel, like you had a really long fixed stock, its still an SBR because the barrel has to be 16 inches to be a rifle.
 
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