The 14.5” complete upper in 5.56mm features a Black anodized upper receiver mated to a unique Mk16 MLOK rail also in Black.  The barrel is 14.5”  Phosphated, Cold Hammer Forged Geissele, Chrome Lined with a 1-7 twist, with nano-coated HUXWRX flash hider, a Geissele low profile bomb-proof factory installed gas block and Geissele's Enhanced BCG.

This is a Geissele Factory upper. For the gun owner looking to build an AR-15 from the ground up with maximum performance-enhancing features, this fully assembled upper receiver from Geissele is a perfect compliment. Geissele Automatics has been a leader in AR-15 products and accessories for years, offering excellent quality and rugged dependability to the war fighter, competitors, and defender alike.

Features:

• Flagship of the Geissele rifle and upper receiver line.
• Chambered in 5.56 NATO
• 14.5” Geissele barrel, CHF, Chrome lined, 1:7 twist
• Manganese Phosphate finish
• Mid-length gas system
• Geissele Super Compact Gas Block
• Geissele 13.5" Mk16 Rail (with unique connecting point to receiver)
• Super Duty Upper with Cam Pin Cut-Out
• Geissele Reliability Enhanced BCG, Nanoweapon Coated
• Geissele Stressproof Bolt, Carpenter 158+
• HUXWRX Flash Hider-QD, Nanocoated, suppressor-ready, pinned & welded
• Airborne Charging Handle
• Type 3 hard coat anodized finish

The Mk16 rail mates to the upper via a center aligning tab removing any chance of rail rotation. This rail is a variant of the 13.5” SMR Mk16, currently fielded by USASOC, and one of Geissele's bestsellers and best ideas.  The Mk16 rail is unique to this upper, as it has the dovetail fit to the upper.  This is not a standard Geissele Mk16 rail, nor is the upper a standard Geissele upper.  The two are meant to be used as one system.  At Charlie's, we like the way in which the upper mates to the rail, which also is a crutch to better align the rail and upper receiver.  That is a good thing.

The barrel is precision machined and cold hammer forged in-house at Geissele. The Mod 1 features a mid-length gas system is perfect for the 14.5" barrel, and includes a Geissele gas Block installed at the factory with both lower set screws and a through the barrel pin.  This is something Geissele has been doing since 2018.  Is it necessary? No.  Extra protection from a gas block moving, which was never going to move in the first place, but something about the Geissele name has that German sound to it, that causes the entire firm to over-engineer, like Mercedes.

The Geissele REBCG is Nano-coated for lubricity and superior protection from the elements.  The Reliability Enhanced BCG is DLC coated in what Geissele calls "Nanocoating" and is machined from mil-spec 8620 steel, with a properly torqued and staked, chrome lined gas key. The REBCG also features extended upper rails, providing greater stability and dramatically increasing feeding reliability. The REBCG is properly torqued and staked, chrome lined gas key. The Cam Pin is machined from advanced, medical steel known as H13 which is also coated with Nanoweapon for maximum corrosion and wear resistance. The Geissele Reliability Enhanced Bolt Carrier Group also features extended upper rails, providing greater stability and dramatically increasing feeding reliability.

The Geissele Reliability Enhanced Bolt Carrier Group comes with the Geissele Stressproof Bolt. Made from Carpenter 158+, directly developed with Carpenter Steel metallurgists to create a material that is cleaner and has less impurities. This makes our Stressproof bolt stronger and more fatigue resistant. The Geissele Stressproof bolt is also forged, not machined from bar stock. This allows us to optimize the grain structure of the steel to yield a bolt capable of 5 times the life of a mil-spec bolt. Each bolt is rigorously inspected, high pressure tested, mag particle inspected and Nanoweapon coated.

Nanoweapon coated, and requires less oil.

The Super Duty upper also includes the  Airborne Charging Handle in black.  

Note:  The Mod 1 features some improvements:  the mid-length gas profile is retained, the reinforced QD slot on the rail is now standard, and a change to a HUXWRX flash hider, which is pinned and welded in place. Geissele has, over the years, used a number of different flash hiders.  The HUXWRX is a good change, while some will long for the Surefire, for sure.  LOL.

At Charlie's we offer discounts on key suppressors and optics when purchased with a factory upper or rifle, so be sure to ask.

The Super Duty Complete Upper from Geissele Automatics offers unmatched performance, accuracy and reliability.