KWA OEM Replacement Part #363 - RM4 ERG One-Piece Upper Receiver Assembly

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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...


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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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