HEAT CORE Valve Stem O-Ring Pack (Pack of 3)

Replacement HEAT core o-ring in the valve stem (Heat Core 1 schematic, part 10.part) for Milsig markers with HEATCORE (M17 G3, M17 A2, M17 A2 PMC, M5 Magnus, M17 CQC/PMC, M17 ELITE, M17 SMG, M17 XDC, M17 DMR, MK3/Paradigm Pro).

THIS IS NOT COMPATIBLE WITH T17, M-66, GD pistols, K-SERIES MK1/2, PARADIGM 1,

Please note - as from spring 2019, this o-ring have changed color from orange to black.