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Hello, can anyone help me identifying the thread type used in HK416/MR556/MR223 barrel nuts? In another forum thread I read that the HK416 uses metric threads with a 1.5 mm pitch, but the diameter was not specified. Since the AR-15 uses 1.250"-18 TPI (which equals M31.75 x 16.93 mm in metric designation), I suspect something along the lines of M32 or M33 by 1.5 mm.

Also curious about the thread on the HK417/MR762/MR308. Armalite AR-10 uses 1.4375"-18 TPI-3A (M36.5125 x 1.411 mm), while DPMS LR-308 uses 1.4375"-16 TPI-2A (M36.5125 x 1.588 mm). So I suspect something around M36 or M37.

Any info about thread length would also be appreciated.
 
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