Aug A3M1 Conversion Kit 300 Aac Blackout Cal. 16.3'' Bbl Blk

The Heresy Design Aug A3M1 Conversion Kit in 300 AAC Blackout transforms your AUG platform rifle into a dedicated subsonic shooter. This 16.3-inch barrel assembly is purpose-built for suppressed fire and subsonic ammunition, making it ideal for hunters and shooters who want to run their AUG quiet without sacrificing reliability or ease of use. If you're already invested in the AUG platform and want a caliber-swap option that actually works with suppressors and subs, this conversion kit handles the job with minimal fuss.

The conversion is designed around suppressed operation: a pistol-length gas port feeds an upgraded gas piston system, and the 3-setting adjustable gas block lets you dial in the right cycle rate for subsonic loads or standard pressure rounds. The 5/8x24 threaded muzzle is ready for your suppressor out of the box. Installation is straightforward on standard and NATO-spec stocks without requiring modifications to the receiver, so you're not locked into permanent changes. The barrel itself is coated with Isonite on wear surfaces to handle the corrosion and stress of suppressed fire, while the quad rail system includes heat isolators to keep your hand clear of hot gas tubes during extended shooting sessions.

This is a genuine caliber conversion for AUG A3M1 owners—it ships as a complete barrel assembly, so you get everything needed to swap from your original barrel. The anodized aluminum construction matches AUG durability standards, and Heresy backs it with a limited lifetime warranty. Note: compatibility is limited to standard AUG A3M1 models and NATO-stock variants; Steyr AUGA3 SA models are not supported.

Key Features

• 16.3-inch barrel in 300 AAC Blackout for subsonic and standard ammunition
• Pistol-length gas port optimized for suppressed operation
• Upgraded gas piston system with 3-setting adjustable gas block
• 5/8x24 threaded muzzle—suppressor ready
• Isonite-coated wear parts for durability and corrosion resistance
• Anodized aluminum quad rails with heat isolators
• Compatible with standard and NATO-spec AUG stocks; drop-in installation
• Limited lifetime warranty

Specifications

Frequently Asked Questions

Will this conversion kit work with my AUG rifle?

This kit is compatible with standard AUG A3M1 models and rifles equipped with NATO-spec stocks. It is not compatible with Steyr AUGA3 SA models. Installation does not require modifications to the receiver on compatible platforms.

Can I shoot subsonic ammunition through this barrel?

Yes. The pistol-length gas port and upgraded gas piston system are engineered specifically for subsonic operation. The 3-setting adjustable gas block allows you to dial in the proper cycle rate for subsonic loads.

Is this kit suppressor ready?

Yes. The barrel features a 5/8x24 threaded muzzle, the standard thread pitch for suppressors, and the entire design is optimized for suppressed fire with both subsonic and standard pressure ammunition.

What does the kit include?

The conversion kit ships as a complete barrel assembly with the gas system, quad rails, and all necessary components for installation. It does not include a suppressor or mounting hardware beyond the threaded muzzle.