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Daniel Defense
Overview
The Daniel Defense Complete Upper in .300 AAC Blackout features a 10.3-inch barrel, optimized for a pistol gas system, making it ideal for compact builds that require a lightweight and maneuverable profile. This complete upper assembly is designed specifically for the AR-15 platform, allowing builders to easily integrate it into their projects without the need for additional components. It's a popular choice for those looking to create a short-barreled rifle or pistol build that excels in versatility and efficiency.
Daniel Defense Complete Upper Black .300 AAC Blackout 10.3-inch
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Builders on GunPartPicker first added the Daniel Defense Complete Upper Black .300 AAC Blackout 10.3-inch to a build in February 2026.
Updated · from real builds on GunPartPicker
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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