AUTO-ORDNANCE – THOMPSON THOMPSON 1927A-1C 45CAL LT WT

The Auto-Ordnance Thompson 1927A-1C .45 ACP Light Weight is the semi-auto carbine that earned its reputation from the trenches of WWI to the streets of the Prohibition era. This auto-ordnance thompson thompson 1927a-1c 45cal lt wt delivers the iconic look and feel of the original Chicago Typewriter, but with a modern aluminum receiver that shaves off over 3 pounds compared to the steel-frame versions. It runs on a blowback action, cycles reliably with standard 230-grain ball ammo, and accepts stick or drum magazines. If you want a range toy, a collector piece, or a conversation starter that actually shoots, this is it.

Manufacturer	Auto-Ordnance (per manufacturer specs)
Model	Thompson 1927A-1C Light Weight
Material	Aluminum receiver, steel barrel and internal components
Compatibility	Accepts Thompson stick magazines (10, 20, 30 round) and 50-round drum magazines
Finish	Blued steel with walnut furniture
Weight	9.45 lbs (unloaded, per manufacturer specs)
Condition	New

Key Features

• Lightweight Aluminum Receiver: Sheds over 3 pounds compared to the steel-frame 1927A-1. Why it matters: You can carry it all day on the range or in the field without your shoulders screaming after the first drum.
• 16.5-Inch Finely Rifted Barrel: Maintains the classic Thompson profile while keeping the overall length legal for a rifle. Why it matters: You get the same iconic silhouette without needing a tax stamp, and the rifling keeps .45 ACP rounds stable out to 100 yards.
• Adjustable Rear Sight with Protected Front Blade: Elevation and windage adjustments in 1-MOA clicks. Why it matters: You can zero the iron sights for your preferred load and hold a 4-inch group at 50 yards off a bag.
• Blowback Operation with Fixed Firing Pin: No gas system to foul or tune. Why it matters: It runs dirty, runs wet, and runs every time. Less cleaning, more shooting.
• Walnut Stock and Vertical Foregrip: Classic wood furniture with a satin finish. Why it matters: It looks right, feels solid, and the vertical foregrip gives you positive control during rapid fire.

Who It’s For

This is for the shooter who wants the tactile and visual experience of a Thompson without the NFA paperwork. It’s for the collector who actually shoots their guns. It’s for the guy who shows up at the steel plate match with something that doesn’t look like every other AR. If you reload .45 ACP, you’ll love feeding this thing. If you just want a reliable, heavy-hitting carbine that turns heads, it’s for you.

Pros & Cons

• Pros: Authentic Thompson look and feel, reliable blowback action, lightweight enough for all-day shooting, accepts drum magazines, classic walnut furniture.
• Cons: The trigger is heavy and gritty out of the box—expect a 7-8 lb pull with some creep. Aftermarket upgrades exist (e.g., from Geissele or Timney), but they require fitting.

Comparison vs. Similar Rifles

Feature	Auto-Ordnance Thompson 1927A-1C	Zev Technologies OZ9C Carbine	Lone Wolf Distributors Alpha Wolf G19 Carbine
Caliber	.45 ACP	9mm	9mm
Weight	9.45 lbs	6.2 lbs	5.8 lbs
Action	Blowback	Locked breech	Blowback
Magazine Capacity	10, 20, 30, 50	17, 21, 33	10, 15, 17
Barrel Length	16.5 in	16.0 in	16.0 in
MSRP	$1,773.95	$1,899.00	$1,299.00
Authenticity Factor	10/10	2/10	3/10

Frequently Asked Questions

Does this Thompson accept 50-round drum magazines?

Yes. The 1927A-1C Light Weight is compatible with both stick magazines (10, 20, 30 rounds) and the iconic 50-round drum magazine. Note that the drum must be the Auto-Ordnance or Kahr Arms version for proper fitment.

Is this rifle legal to own without a tax stamp?

Yes. The 1927A-1C has a 16.5-inch barrel and an overall length of 41 inches, making it a legal semi-automatic rifle under the National Firearms Act. No stamp or tax required.

What ammunition does it require?

It runs on standard .45 ACP ammunition. Per Auto-Ordnance specs, use 230-grain FMJ for break-in and reliable cycling. Avoid +P loads as they accelerate wear on the aluminum receiver.

Can I mount a scope or red dot?

The receiver is not drilled and tapped for optics. You can use a side-mount rail adapter from aftermarket manufacturers, but the iron sights are excellent for this platform. At 50 yards, you’ll hold a 4-inch group with the factory sights.

How does the weight compare to the steel-frame Thompson?

The steel-frame 1927A-1 weighs approximately 13 pounds unloaded. The Light Weight model saves 3.55 pounds, coming in at 9.45 pounds. That’s a 27% reduction in weight.

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Explore our full selection of Semi Auto Rifles or check out .45 ACP Carbines and Collector Firearms.

Last updated: April 2026