Complete Upper Receiver Groups
5.56 Complete Upper Receivers
Find a top-quality 5.56 complete upper receiver for your AR-15 at Geissele Automatics. All of our 5.56 complete uppers feature the very latest in weapon technology.
We forgo bulk manufacturing to prioritize quality in every component we make, producing uppers that are made in line with the highest military standards and designed to last — handling mud, dirt, and dust with ease.
Find or build an upper receiver in your ideal configuration, from barrel length, profile, twist rate, handguard type, and chamber type.
Choose the most common barrel length at 16” or explore our other options, including 10.3”, 11.5”, and 14.5”. Always manufactured in-house, Geissele barrels are precision machined and cold hammer forged, made only from materials of the highest quality.
Regardless of which one you choose, our complete upper receivers include every component you need to get out on the range and enjoy a day of shooting!
Built for unmatched performance, reliability, and accuracy, our 5.56 complete uppers come in classic black, OD green, and Desert Dirt Color.
Explore more categories from Geissele’s upper receiver groups:
Frequently Asked Questions
A 5.56 complete upper receiver for an AR-15 is a major component of the rifle. It includes a barrel, handguard, charging handle, bolt carrier group, flash hider/muzzle break, and ejection port cover.
The most popular barrel length for a 5.56 AR is 16”. However, you can also purchase an AR barrel in: 10.5”; 11.5”; 12.5”; 14.5”; 18”; 20”.
The Geissele Nanoweapon (or the Picatinny DSL) is a family of Durable Solid Lubricant coatings developed by ARDEC. It is available exclusively from us at Geissele Automatics. We continued the development of Picatinny DSL so that its level of wear, corrosion, and abrasion resistance remains unmatched among firearm coatings.
Geissele models include the Super Duty Upper Receiver, the Duty Upper Receiver Group, and the URG-I Complete, Near Clone. We offer a limited lifetime warranty on all of our firearms, components, and tools, including upper receivers, against defects in workmanship and materials.
