RETRO ARMS - CNC Machined Aluminum Rotary Hop-Up Unit M4 M16 Airsoft AEG Color:M4/M16 EMG Black Fully upgradable version 3 metal pcp .457 cal 54594 Color:COMBAT GREY Compatibility For GBBRs and
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Ships within 48 hours · Estimated delivery Oct 8 - Oct 13