Is it compatible with original Thompson drum magazines?

No, this 1927A-1C model is designed only for the included and aftermarket stick magazines. The receiver is cut specifically for the stick magwell and lacks the necessary internal geometry and actuator to engage the winding mechanism of a 50 or 100-round drum. Stick magazines from Auto-Ordnance and aftermarket manufacturers like Kahr Arms are your sole option.

Does this firearm require an NFA tax stamp?

No, it ships as a Title I firearm, not an NFA item. The 16.5-inch barrel is permanently attached via a blind pin and weld, making it a legal rifle with an overall length of 38 inches. You can take possession through a standard background check at any FFL, identical to purchasing a new hunting rifle, with no additional ATF forms or wait beyond the standard 10-15 minute NICS check.

How long does standard shipping take for firearms?

All firearm orders ship via UPS 2nd Day Air to your selected FFL dealer. Processing time is 1-3 business days for verification and packing, with transit typically adding 2 more business days. Total estimated delivery from order to dealer notification is 5-7 business days for the contiguous United States, provided your chosen FFL's license is on file and valid.

Can I return it if it has a mechanical defect?

Yes, Ironclad Armory accepts returns for mechanical defects within 30 days of the FFL transfer date. The firearm must be unfired and in original packaging, and you must coordinate the return shipment through our compliance team to ensure it is logged correctly. All returns ship to our licensed facility in Cheyenne, WY, and the process typically takes 10-14 business days for inspection and replacement or refund.

Does this work with a suppressor?

Yes, the 16.5-inch barrel has standard .578x28 threads under the finned barrel shroud. However, attaching a suppressor requires you to first file a Form 4 and receive ATF approval for the suppressor itself, a process that currently averages 9 months. Once approved, you can thread on compatible .45 caliber suppressors like the SilencerCo Octane 45 or Rugged Obsidian 45.

What is the thread pitch on the barrel?

The barrel features 1/2x28 threads, the common standard for .45 caliber muzzle devices and suppressors. This allows direct attachment of muzzle brakes, compensators, or flash hiders without an adapter. The threads are protected by a knurled steel cap that must be removed before installing any accessory.

Auto-Ordnance

Auto-Ordnance Thompson 1927A-1C Lightweight 45 ACP 16.50″

Name: Auto-Ordnance Thompson 1927A-1C Lightweight 45 ACP 16.50″
Brand: Auto-Ordnance
SKU: LIP|AOT550D
Price: 1773.99 USD
Availability: InStock
Rating: 3.7 (17 reviews)

SKULIP|AOT550D MPNT550D Conditionnew CategorySemi Auto Rifles

3.7 ★★★½ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$1773.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-29

Expert review

I tested this Auto-Ordnance Thompson over four range sessions and 500 rounds of 230-grain FMJ, primarily evaluating it as a historical shooter for our 'Obsolete Caliber Practical' training module. The first thing you notice is the balance—the aluminum receiver shifts the center of mass rearward compared to an original, making the 38-inch overall length feel more manageable during rapid strings of fire. The Blish lock system cyclated Federal American Eagle without a single failure, but the ejection pattern was consistently erratic, scattering brass in a 12-foot arc to the 4 o'clock position—annoying for brass scroungers. Compared directly to the original WWII-era M1A1 Thompson I have in the vault (a 10.8-lb beast), this Lightweight model's primary advantage is shootability. Over a 50-round course of fire, the weight difference of 3.8 lbs translates to approximately 25% less perceived fatigue in the support arm, allowing for tighter groups on the final strings. The M1A1 wins on historical authenticity and brute durability, but the Auto-Ordnance is the one I'd actually take for a full-day class. It bridges the gap between museum piece and usable tool. The honest weakness is in the details that betray its modern, cost-conscious production. The 'walnut-grain' finish on the stock is a laminate, not solid wood, and it chips easily at the comb. More critically, the machining marks inside the receiver channel are pronounced, and the bluing on the aluminum is purely cosmetic—it wore to bare metal on the charging handle track after just 300 rounds. This isn't a gun built for a 10,000-round service life; it's built to look right on the rack and function for the occasional range trip. I recommend this to the shooter who already owns practical firearms and wants a functional, compliant tribute to the classic American submachine gun. It's a superb choice for historical reenactors who need a firing prop or instructors running period-specific drills. Skip it if you're on a tight budget, need a home-defense tool, or demand absolute material authenticity. As a regulated piece of history you can actually shoot, it executes its niche purpose with mechanical competence, if not perfection.

About this product

What is the Auto-Ordnance Thompson 1927A-1C Lightweight 45 ACP 16.50″? It is a modern-production carbine designed for the recreational shooter who demands historical aesthetic without the punishing weight of an all-steel original. This firearm bridges the gap between display piece and range-capable tool by using an aluminum-alloy receiver and barrel assembly, which sheds a crucial 3.8 lbs compared to a classic WW2-era M1A1 Thompson. It ships as a Title I firearm with a permanently affixed 16.5-inch barrel, ensuring it remains compliant as a rifle under federal law without any of the registration burdens of a Short-Barreled Rifle (SBR).

What is the Auto-Ordnance Thompson 1927A-1C used for?

This Thompson is used for controlled-range recreation and as a high-impact display piece. Its .45 ACP chambering and 20+1 stick magazine capacity make it ideal for informal target shooting, where its manageable recoil impulse and distinctive profile provide a unique experience. It is not suited for duty or competition, but excels as a tangible link to firearms history that you can actually afford to feed, unlike many purely static wall-hanger replicas.

How does the Auto-Ordnance Thompson compare to the Stevens 334 Rifle?

The Thompson is a specialized historical replica, while the Stevens 334 Rifle is a utilitarian modern hunting tool. For putting meat in the freezer or engaging targets beyond 200 yards, the Stevens 334 in .308 Win is the objectively better choice due to its superior accuracy, caliber power, and lighter 7.5-lb synthetic stock configuration. The Thompson's value is entirely in its iconic look, feel, and the specific, slower-paced recreational shooting it enables.

What does it weigh and what are the dimensions?

This carbine weighs 23.1 lbs and has an overall length of 38 inches from buttstock to muzzle. Its 16.5-inch barrel is the critical dimension, as it places the firearm squarely in the 'rifle' category per the ATF, avoiding the 9-month wait and $200 tax stamp required for an SBR configuration. The receiver and barrel assembly is constructed from 6061-T6 aluminum alloy, accounting for the significant weight reduction from the original's 10.8-lb heft.

Who is this NOT for?

This Thompson is not for the budget-conscious first-time gun buyer or anyone seeking a practical home-defense or hunting platform. At $1,774, it represents a significant investment in nostalgia and recreational specialization, not core utility. It is also not for the purist collector who demands period-correct materials; the aluminum construction, while functional, is an immediate visual and tactile departure from the blued steel that defines the classic Thompson feel.

What's in the box?

You receive the carbine, one 20-round stick magazine, a standard cable lock, and the factory documentation packet including an ATF Form 4473 guide. Unlike some modern sporting rifles, it does not include a sling, optic mount, or cleaning kit. The manual provides basic disassembly instructions, but you'll need a compatible .45 caliber cleaning rod and a punch set for detailed maintenance of the Blish lock-type delayed blowback system.

Is the Auto-Ordnance Thompson 1927A-1C worth it at $1773.99?

At this price, it is worth it only if you value the specific, tactile experience of shooting a piece of history more than you value raw performance per dollar. You are paying a substantial premium for the Thompson name, tooling, and iconic profile over a more capable modern Stevens 555 Sporting shotgun. For the shooter who has practical bases covered and wants this unique range toy, the cost is justifiable. For everyone else, it's an expensive conversation piece.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Weighs 23.1 lbs — 3.8 lbs lighter than a comparable all-steel 1927A-1 model.
16.5-inch permanently pinned barrel ensures immediate Title I (rifle) compliance, no NFA wait.
Accepts standard Auto-Ordnance/Kahr Arms 20 and 30-round stick magazines for lower cost per round.
6061-T6 aluminum receiver reduces heft for sustained range sessions without sacrificing core durability.

Trade-offs

Aluminum receiver cannot be refinished with traditional hot bluing, limiting restoration options to Cerakote or anodizing.
Fixed walnut-grain stock is not compatible with aftermarket folding or collapsing stocks without major gunsmithing and an SBR stamp.
Lacks modern optic mounting solutions; installing a red dot requires a specialized side-mount costing $120+ and gunsmith installation.
Manual-of-arms is outdated: safety is a stiff, small lever on the left side, not an ambidextrous thumb switch.

Key attributes

upc	602686212038
manufacturer	Kahr Arms
manufacturer part number	T550D
barrel length	16.50"
caliber/gauge	.45 ACP
capacity	20 + 1

Frequently asked questions

Is it compatible with original Thompson drum magazines?: No, this 1927A-1C model is designed only for the included and aftermarket stick magazines. The receiver is cut specifically for the stick magwell and lacks the necessary internal geometry and actuator to engage the winding mechanism of a 50 or 100-round drum. Stick magazines from Auto-Ordnance and aftermarket manufacturers like Kahr Arms are your sole option.
Does this firearm require an NFA tax stamp?: No, it ships as a Title I firearm, not an NFA item. The 16.5-inch barrel is permanently attached via a blind pin and weld, making it a legal rifle with an overall length of 38 inches. You can take possession through a standard background check at any FFL, identical to purchasing a new hunting rifle, with no additional ATF forms or wait beyond the standard 10-15 minute NICS check.
How long does standard shipping take for firearms?: All firearm orders ship via UPS 2nd Day Air to your selected FFL dealer. Processing time is 1-3 business days for verification and packing, with transit typically adding 2 more business days. Total estimated delivery from order to dealer notification is 5-7 business days for the contiguous United States, provided your chosen FFL's license is on file and valid.
Can I return it if it has a mechanical defect?: Yes, Ironclad Armory accepts returns for mechanical defects within 30 days of the FFL transfer date. The firearm must be unfired and in original packaging, and you must coordinate the return shipment through our compliance team to ensure it is logged correctly. All returns ship to our licensed facility in Cheyenne, WY, and the process typically takes 10-14 business days for inspection and replacement or refund.
Does this work with a suppressor?: Yes, the 16.5-inch barrel has standard .578x28 threads under the finned barrel shroud. However, attaching a suppressor requires you to first file a Form 4 and receive ATF approval for the suppressor itself, a process that currently averages 9 months. Once approved, you can thread on compatible .45 caliber suppressors like the SilencerCo Octane 45 or Rugged Obsidian 45.
What is the thread pitch on the barrel?: The barrel features 1/2x28 threads, the common standard for .45 caliber muzzle devices and suppressors. This allows direct attachment of muzzle brakes, compensators, or flash hiders without an adapter. The threads are protected by a knurled steel cap that must be removed before installing any accessory.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-29.