PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH
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Palmetto State Armory
Overview
The PSA PA-9 Gen4 10.5" upper is a complete assembly designed for the AR-9 platform, featuring a 10.5-inch barrel optimized for 9mm caliber. With a twist rate of 1:10, it provides a balance of stabilization for various bullet weights, making it suitable for a range of ammunition choices. This upper is commonly found in builds focused on 9mm performance, ideal for those looking to create a compact yet effective firearm.
Specifications
PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH
September 2026 on GunPartPicker
PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH ranked #168 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #465 of the 1,654 upper receivers builders have added.
Today the one retailer we track has it in stock. Buying today, the lowest price is $339.99 at Palmetto State Armory.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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