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Colt
Overview
The Colt M4 Upper Receiver Assembly is a upper receiver. Compare prices from multiple merchants and find the best deal.
Specifications
September 2026 on GunPartPicker
Colt M4 Upper Receiver Assembly ranked #84 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since April 2026. All time, it ranks #121 of the 1,704 upper receivers builders have added. Builds with this upper receiver are mostly chambered in 5.56 NATO (75%, then .223 Wylde 25%), nearly all on mid-length gas, and nearly all AR-15.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $179.99 at AR15 Discounts for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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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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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
CaliberBased on real build data showing which calibers builders choose alongside this product.
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