ATA Arms Adler HT-104 12 Gauge Semi-Auto 18.5″ Black

The ATA Arms Adler HT-104 12 Gauge Semi-Auto 18.5″ Black is a piston-operated 12 Gauge semi-automatic shotgun engineered for training, range work, and defensive readiness. Its compact 18.5″ barrel and 7075-T6 aluminum receiver deliver balanced handling and straightforward controls for practical, real-world use.

Manufacturer	ATA Arms
Model	Adler HT-104
Material	Synthetic stock, 7075-T6 aluminum receiver
Compatibility	12 Gauge shells, 2.75″ and 3″ magnum
Finish	Black matte synthetic, anodized aluminum
Weight	6.3 lbs (per manufacturer specs)
Condition	New

Key Features

• Piston Operating System — why it matters: self-regulating gas action reduces felt recoil and keeps the action cycling reliably with light target loads or heavy defensive rounds, so you stay on target faster.
• Compact 18.5″ Barrel — why it matters: short enough for tight home-defense corners but still delivers full velocity and pattern density at range, giving you a do-it-all length.
• 7075-T6 Aluminum Receiver — why it matters: this aircraft-grade alloy is lighter than steel yet tough enough for thousands of rounds without flex or wear, keeping the shotgun balanced and corrosion-resistant.
• Oversized Rubber Butt Pad — why it matters: reduces felt recoil impact by up to 40% compared to standard pads, so you can shoot longer without shoulder fatigue during training classes.
• 4+1 Capacity with Drop-Free Magazine — why it matters: four rounds ready plus one in the chamber gives you enough firepower for defensive scenarios while the drop-free design ensures fast, fumble-free reloads.

Who It’s For

Tech-savvy shooters who want a reliable semi-auto without the premium price tag. If you’re building a home-defense setup, training on a budget, or need a rugged range gun that cycles everything from Walmart birdshot to 3″ buckshot, this Adler HT-104 is your entry point. Early adopters will appreciate the anodized receiver and piston system — features usually found on shotguns costing twice as much.

Pros & Cons

• Pro: Piston-driven reliability with minimal cleaning needed — shoot dirty and it keeps running.
• Pro: Lightweight at 6.3 lbs — easy to swing in tight spaces or carry all day.
• Con: Aftermarket parts support is still growing — you may need to wait for new barrels or stocks compared to more established platforms.

Comparison

Feature	ATA Arms Adler HT-104	Mossberg 930 JM Pro	Remington 870 Express
Action	Semi-auto, piston	Semi-auto, gas	Pump-action
Barrel Length	18.5″	22″	18.5″
Weight	6.3 lbs	7.5 lbs	7.0 lbs
Capacity	4+1	6+1	4+1
Receiver Material	7075-T6 Aluminum	Steel	Steel
Price	$232.79	$650+	$400+

FAQ

What shells does the Adler HT-104 cycle reliably?

Per ATA Arms specs, the HT-104 cycles 2.75″ and 3″ magnum shells. Most shooters find it runs 1200+ FPS target loads without hiccups after a 50-round break-in.

Is the receiver compatible with aftermarket triggers?

No — the 7075-T6 aluminum receiver uses a proprietary trigger pack. Stick with factory parts or wait for aftermarket support to expand.

Does it come with a choke?

Yes, it includes a cylinder choke installed. You can swap to improved cylinder or modified chokes (not included) for pattern tuning.

How do I clean the piston system?

Disassemble the forend, remove the piston assembly, wipe carbon deposits with a brush, and lightly oil. No special tools needed — it’s simpler than a gas-piston AR.

Can I mount a red dot on the receiver?

The receiver is drilled and tapped for a standard Weaver-style rail (not included). You can mount most red dots or low-power optics with the right base.

✅ Nationwide delivery — ships to all 50 states
✅ Ships 1-2 business days from our warehouse
✅ 30-day returns — no restocking fee
✅ Secure checkout — encrypted payment gateway

Browse more: Semi Auto Shotguns | Defensive Shotguns | ATA Arms

Last updated: April 2026