Heckler & Koch 16.5″ 5.56 MR556 Barrel, 1:7 Twist A genuine German and OEM barrel assembly for use in your MR556. Cold-hammer forged. 1 in 7 twist and threaded in 1/x28. Compatible with MR556 rifles. Semi-auto, not compatible for use in machineguns. Click here to browse our entire selection of Hecker & Koch.
