M4 5.56 Complete Monolithic Upper Receiver Groups - M4 LE6940 Upper Group 16in Stripped
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Overview
The Colt M4 5.56 Complete Monolithic Upper Receiver Group is a stripped upper designed specifically for the AR-15 platform, featuring a 16-inch barrel optimized for 5.56 NATO ammunition. This upper receiver group maintains the M4 receiver type, offering a seamless integration of components that enhances the overall build quality and performance. Builders often choose this upper for tactical or sporting setups where reliability and accuracy are paramount.
Specifications
M4 5.56 Complete Monolithic Upper Receiver Groups - M4 LE6940 Upper Group 16in Stripped
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Build history on GunPartPicker
Builders on GunPartPicker first added the Colt M4 5.56 Complete Monolithic Upper Receiver Groups - M4 LE6940 Upper Group 16in Stripped to a build in March 2026.
It was out of stock everywhere we track for all of September 2026, and today the one retailer we track is out of stock. Listed prices start at $1,070.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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