Colt GAU-5A Lightning Series Gas Blowback Rifle (EMG/Cyma CGS - MWS - COLT.1016-LS)

The USAF Commando Legend

While the US Army utilized the XM177 series in the jungles of Vietnam, the US Air Force adopted their own distinct variant: the GAU-5/A. The EMG/Cyma GAU-5A flawlessly captures the unique, aggressive silhouette of this legendary Air Force weapon. The most notable historical feature is its "slick-side" upper receiver. Because the Air Force did not believe the forward assist was necessary, the GAU-5A features a smooth upper profile, giving it a sleek and distinct look compared to standard M16s. Paired with a short barrel, the iconic oversized flash moderator, and a two-position aluminium retractable stock, it provides exceptional CQB manoeuvrability while maintaining a deeply authentic historical aesthetic.

Authentic Licensed Externals

To satisfy the most demanding historical re-enactors and mil-sim players, this GBBR boasts uncompromising external build quality. The precision-cast aluminium alloy upper and lower receivers are flawlessly finished and bear deeply engraved, fully licensed Colt manufacturing trademarks and roll marks. True to the era, the upper receiver features a fixed A1-style carry handle and an A1 rear sight adjustable for windage. The rifle is completed with the classic ribbed, round polymer handguards and an original A1-style slim profile pistol grip.

Tokyo Marui MWS ZET System Compatibility

The beauty of the Cyma Gas System (CGS) lies under the hood. Engineered in collaboration with T8 (SP Systems), the internal architecture is fully cross-compatible with the legendary Tokyo Marui MWS gas blowback system. This gives you a massive tactical advantage. Not only does the rifle deliver incredible out-of-the-box reliability and a deeply satisfying recoil impulse, but it also opens the door to the largest aftermarket upgrade ecosystem in the GBBR world. You can effortlessly use standard TM-spec MWS magazines, and you have complete freedom to tune your hop-up, inner barrel, and fire control group using widely available MWS components.

"Lightning Series" Performance

What elevates this specific model to elite status is its "Lightning Series" internal designation. To maximize the rifle's cyclic rate and gas efficiency, it is equipped with a specialized lightweight aluminium bolt carrier group. Because the bolt is significantly lighter than standard zinc-alloy bolts, it requires less gas pressure to cycle. This results in an incredibly snappy trigger response, vastly improved performance in colder weather, and the ability to unleash rapid suppressive fire without suffering severe cool-down effects. To ensure the weapon can handle this blistering speed, the internal trigger mechanism, bolt catch, and front sight post are all constructed from heavy-duty steel for ultimate longevity.

Key Features at a Glance

• Fully Licensed: Features deep-engraved, authentic Colt manufacturing trademarks and roll marks.

• MWS Compatible: CYMA Gas System (CGS) accepts standard TM MWS aftermarket parts and magazines.

• USAF Slick-Side Upper: Historically accurate upper receiver lacking the forward assist.

• Lightning Series Bolt: Upgraded lightweight aluminium bolt carrier group for a blisteringly fast cyclic rate and extreme gas efficiency.

• Steel Internals: Factory-upgraded with a reinforced steel trigger mechanism, bolt catch, and front sight.

• Vietnam Era Aesthetics: Iconic GAU-5 moderator, ribbed round handguards, and fixed carry handle.

• Retro Stock: Features the classic, period-accurate two-position aluminium retractable buttstock.

• Period-Accurate Magazine: Includes a classic VN-style short green gas magazine.

• 14mm CCW Threading: Removing the moderator reveals standard threading for modern suppressors and tracer units.

The Verdict

The Colt GAU-5A Lightning Series (COLT.1016-LS) is a flawless blend of US Air Force history and cutting-edge airsoft engineering. By pairing the unmistakable, slick-side profile of the elite PJ carbine with the limitless upgrade potential of the MWS system and a fast-cycling Lightning bolt, it stands as one of the most unique and capable retro CQB gas blowback rifles available today.