The Auto-Ordnance Thompson 1927A-1 SBR with drum and stick magazines is the horizontal-foregrip version of the company’s .45 ACP short-barreled rifle (brand part no. T1SB50DH). Auto-Ordnance calls the Thompson SBR its gun closest in dimensions and weight to the original submachine gun of the 1920s. It runs semi-automatic from a closed bolt behind a finned 10.5-inch barrel, with the frame and receiver machined from solid steel and finished in blue. A genuine American walnut stock and the traditional horizontal foregrip complete the classic profile. Both feeding options come in the box, a 50-round drum and a 20-round stick, which makes this the configuration for the collector who wants the full Thompson experience.

Key Specifications

• The chambering is .45 ACP, the big-bore pistol cartridge the Thompson was built around.
• The barrel is 10.5 inches and finned, which is what makes this rifle an SBR.
• With the compensator fitted, barrel length reaches 12.5 inches, the figure Auto-Ordnance lists for this model.
• The action is semi-automatic from a closed bolt, one round per trigger pull.
• The frame and receiver are machined from solid steel, giving the heft of the original.
• The finish is blued steel, the traditional Thompson look.
• The furniture is a walnut fixed stock with a horizontal foregrip, the classic 1927A-1 profile.
• Overall length is 35 inches, close to the original submachine gun.
• Weight is 12 pounds, enough mass to soak up .45 ACP recoil.
• It ships with a 50-round drum and a 20-round stick magazine, so both classic feeding options are covered.

Frequently Asked Questions

What magazines come with it? One 50-round drum magazine and one 20-round stick magazine.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for short-barreled rifles. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply. Taking an SBR across state lines still requires an approved ATF Form 5320.20.

Is it semi-automatic? Yes. Auto-Ordnance builds the Thompson SBR as a semi-automatic that fires from a closed bolt.

Buy the Auto-Ordnance Thompson 1927A-1 SBR with 50-Round Drum

As of October 9, 2026, this short-barreled rifle transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Steel, walnut and a drum make for a range session nobody forgets. Order through Kahr Arms‘s short-barreled rifle lineup and our Lubbock, Texas team will handle the transfer.