The Maxim Defense PDX is a compact, factory SBR chambered in .300 Blackout, developed for a tier-one military contract and competing with the Sig Rattler. It features a short 4-inch buffer tube, proprietary Hatebrake muzzle device for reliability and flash suppression, and high-end components. While offering premium build quality, its MSRP is high, and suppressed performance with supersonic .300 BLK can be inconsistent.
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