PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH - 5165449744
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Palmetto State Armory
Overview
The PSA PA-9 Gen4 upper receiver is a complete assembly designed for the AR-15 platform, featuring a 10.5-inch barrel with a 1:10 twist rate, making it suitable for stable performance with a variety of 5.56 NATO ammunition. This upper is tailored to provide reliable functionality and accuracy, ideal for builders looking to create a compact and versatile firearm. Commonly found in short-barreled rifle builds, this upper enhances maneuverability while maintaining the ballistic performance expected from a quality AR-15 configuration.
Specifications
PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH - 5165449744
Available Merchants(1)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the PSA PA-9 GEN4 10.5" 9mm 1/10 Nitride 12" Slanted M-LOK Railed Upper With BCG & CH - 5165449744 to their builds on GunPartPicker since February 2026. All time, it ranks #486 of the 1,709 upper receivers builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today the one retailer we track has it in stock. Prices barely moved in September 2026, holding around $339.99, so there haven't been real sales lately. Buying today, the lowest price is $339.99 at Palmetto State Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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