RM4 ERG One-Piece Upper Receiver Assembly
KWA OEM Replacement Part #363
Now available for the first time, the RM4 ERG one-piece upper receiver fits all KWA RM4 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). The upper receiver appears as part 363 on the RM4 Series diagrams.
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- Online purchases: 14 days from the date of delivery with copy of emailed receipt for exchange or store credit only. NO EXCEPTIONS!
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- All used items have been tested and are sold "AS IS", and are not eligible for return.
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