Description
Overview
The Geissele Automatics Super Duty MOD-1 Complete Upper Receiver 10.3″ is a rugged, professional grade AR-15 upper built for heavy use and reliable performance. It combines a robust 10.3″ barrel with a free float rail and tuned gas system to deliver smooth operation under demanding conditions. Available in both Black and Flat Dark Earth, this upper is assembled with premium components so you can mount it on a compatible lower and go straight to work or training.
What It Does
This complete upper receiver group gives your rifle a compact yet capable configuration that excels in close quarter environments, dynamic training, or daily carry rifles. The 10.3″ barrel offers quick handling while maintaining effective velocity with 5.56 NATO or .223 Remington ammunition. A free float rail system provides continuous space for optics, lights, lasers, and back up sights. A premium bolt carrier group and charging handle are installed to support reliable cycling and consistent performance from the first round to the last.
Features
- 10.3″ barrel tuned for smooth handling and performance.
- Free float rail system with modular attachment points.
- Premium bolt carrier group included for dependable operation.
- Ambidextrous charging handle for versatile manipulation.
- Carbine length gas system tuned for consistent cycling.
- Rugged construction built for heavy use.
- Available in both Black and Flat Dark Earth finishes.
Specs
- Chambered in 5.56 NATO / .223 Remington for broad ammunition compatibility.
- 10.3″ barrel with carbine length gas system.
- Free float rail for generous accessory space.
- Mil-Spec indexed upper receiver with continuous rail space.
- Includes bolt carrier group and charging handle.
FAQ
Will this fit my AR-15 lower?
Yes. It’s designed to mate with standard AR-15 lowers using typical barrel extension and pin spacing.
Is this a complete upper?
Yes. It arrives assembled with all major components installed and ready to mount.
What caliber does it use?
It is chambered in 5.56 NATO and .223 Remington, allowing use with a wide range of common rifle ammunition.
Can I mount optics or accessories?
Yes. The free float rail gives ample continuous space for sights, lights, lasers, and other gear.
Does it cycle reliably?
Yes. The tuned gas system and premium components support smooth cycling and consistent performance.
Is it durable?
Yes. Its rugged construction and quality components are built to withstand heavy use in training and tactical environments.
