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Palmetto State Armory
Overview
The PSA 16" M4 Nitride Upper Receiver is a complete assembly designed for the AR-15 platform, featuring a 16-inch barrel chambered in 5.56 NATO. With a carbine-length gas system and a 1:7 twist rate, this upper is optimized for stability and accuracy, allowing you to effectively stabilize a variety of bullet weights. This upper is commonly used in versatile builds that prioritize both range and maneuverability, making it suitable for everything from tactical applications to recreational shooting.
PSA 16" M4 Nitride 1:7 MOE Black Freedom Upper With BCG & CH - 508045
Prices checked
PSA 16" M4 Nitride 1:7 MOE Black Freedom Upper With BCG & CH - 508045 ranked #360 of the 844 upper receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #458 of the 2,066 upper receivers builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today the one retailer we track has it in stock. Prices barely moved in October 2026, holding around $299.99, with no real sale all month. Buying today, the lowest price is $309.99 at Palmetto State Armory.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
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