The 11.5” complete upper in 5.56 NATO features a black upper receiver mated to a unique Mk16 M-LOK rail with 11.5” Black Oxide coated, Cold Hammer Forged Geissele, Chrome-Lined 1-7 twist barrel, with nano-coated HUXWRX Flash Hider-QD, and a Geissele low profile bomb-proof factory installed Super Compact Gas Block.
This is a Geissele Factory upper (08-544B).
Geissele barrels are precision machined, chrome-lined, and cold hammer forged. The carbine length gas system is perfect for the 11.5" barrel, and includes a Geissele Super Compact Gas Block installed at the factory with both lower set screws and cross pin. This is something Geissele has been doing since 2018. Is it necessary? No, but an ounce of prevention is worth a pound of cure.
The newly designed 10.5” Super Modular Rail MK16 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 best sellers and best ideas. 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.
Geissele Reliability Enhanced Bolt Carrier Group
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 has a properly torqued and staked, chrome-lined gas key. The REBCG is Nanoweapon coated, and requires less oil. 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 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 the Stressproof bolt stronger and more fatigue resistant. The Geissele Stressproof bolt is also forged, not machined from barstock. This optimizes 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.
The Mod 1 Geissele Super Duty ships with a HUXWRX Flash Hider-QD 556 which also serves to accept HUXWRX silencers. The other part of the Mod1 upgrade is the stainless inserts or grommets in the QD sling connections for reinforcement.
The Super Duty upper also includes the Airborne Charging Handle. The Mk16 SMR 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.
The Super Duty Complete Upper from Geissele Automatics offers unmatched performance, accuracy and reliability.
Pics courtesy of Geissele, Potomac Armory and Charlies Custom Clones
Note: Charlie's also offers the stripped upper here: Geissele Super Duty 11.5" stripped Upper Receiver Group, factory new
SPECS:
| LENGTH: | 11.5" |
| CALIBER: | 5.56 NATO |
| COLOR: | Black |
| RECEIVER: | Geissele Super Duty Upper w/ dovetail cut-out (only fits Geissele Mk16 dovetail rail) |
| BOLT CARRIER GROUP: | Geissele Nanoweapon Reliability Enhanced BCG |
| BOLT: | HPI/MPI Carpenter Steel high impact bolt, either Mil-Spec of Geissele |
| RAIL: | 10.5" SMR MK16 with receiver dove-tail |
| BARREL: | 11.5" Geissele Barrel, CHF, Chrome Lined, 1-7 Twist, Black Oxide treated |
| GAS SYSTEM: | Carbine Length |
| GAS BLOCK: | Super Compact Gas Block |
| CHARGING HANDLE: | Airborne Charging Handle |
| MUZZLE: |
Nanoweapon coated HUXWRX Flash Hider-QD 556 |
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Geissele
Geissele
Geissele