PSA GEN4 4" 9mm 6" Lightweight M-LOK Railed Upper - With BCG & CH
Palmetto State Armory
Overview
The PSA Gen4 4" 9mm Lightweight M-Lok Railed Upper is a complete upper assembly designed specifically for the AR-9 platform, offering a compact and efficient option for your 9mm builds. Crafted from billet aluminum, this upper combines strength with a lightweight profile, making it ideal for quick handling and maneuverability. This upper commonly appears in builds focused on 9mm performance, perfect for both competitive shooting and personal defense applications.
Specifications
PSA GEN4 4" 9mm 6" Lightweight M-LOK Railed Upper - With BCG & CH
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September 2026 on GunPartPicker
PSA GEN4 4" 9mm 6" Lightweight M-LOK Railed Upper - With BCG & CH ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026.
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Frequently Built With
The part most often added in each category by the builds that include this one
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