The RM4 and VM4 one-piece upper receiver fits all KWA RM4 and VM4 Series rifles, including the original Magpul PTS ERGs, the new RM4A1, and the new RM4 KR KeyMod Rail Series (although it is not compatible with the KeyMod Rail, which fits to the fluted version of the upper which is not available for individual sale). The upper receiver appears as part 363 on the RM4 and VM4 Series diagrams.



Weight .62 lbs
Dimensions 8 × 1.5 × 2.5 in