The perfect base for any CRBN or HPA build - the G&G M4 Polymer Lower allows you to start a new build without needing to buy a whole base gun!
It interfaces perfectly with our CRBN Uppers, CRBN Gearbox, and AirTac Aluminum endcap. This G&G M4 Polymer Lower Includes:G&G M4 Polymer Lower:
Lightweight polymer construction, perf
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36 ratings
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Speedy shipping. Came exactly as advertised
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Sean · August 18, 2026
My delivery arrived in a timely manner and as described. Great product...