The Thompson 1927A-1 Lightweight Deluxe is a semi-automatic pistol chambered in .45 ACP, built around the silhouette and heritage of the original Thompson submachine gun. It's a long gun at 41 inches overall and 10.5-inch barrel, more range toy and collector piece than practical carry option. And that's exactly the point. 
 

Key Specifications 

• Brand: Thompson 
• Model: 1927A-1 Lightweight Deluxe 
• Caliber: .45 ACP 
• Action: Semi-Auto 
• Capacity: 100 Rounds 
• Barrel Length: 10.5 inches 
• Weight: 5.9 lbs (93.90 oz) 
• Overall Length: 41 inches 
• Safety Feature: Manual Thumb Safety 
• Grip Material: American Walnut 
• Sight Configuration: Blade Front & Fixed Battle Rear 
   

Features 

 
The 100-round drum magazine is the defining feature here. It means extended range sessions without stops, though that drum adds weight when fully loaded. The receiver has a black hard coat anodized finish. Sights are a blade front and fixed battle rear, adequate for the intended use. American walnut grips give it the period-correct look and provide a secure hold. Manual thumb safety is straightforward to operate. 
 
The semi-auto action cycles reliably in .45 ACP. The blade/rear sight setup handles quick acquisition well enough at typical range distances. The overall package leans heavily into the nostalgia and visual appeal of the Tommy gun lineage, and it delivers on that front.

The Thompson 1927A-1 Lightweight Deluxe draws a specific crowd, and feedback reflects that. Collectors and history buffs are consistently positive about it, drawn to the Prohibition-era and WWII associations the Thompson name carries. The design (wood accents, drum magazine, distinctive profile) gets a lot of appreciation from people who value that aesthetic.

On the performance side, most users report reliable cycling and reasonable accuracy for range use. The .45 ACP caliber does produce noticeable recoil, and the 100-round drum fully loaded makes the gun heavier and changes the balance, which some users find awkward.

Price is a sticking point in discussions. Many feel the quality and heritage justify the cost; others think comparable semi-auto pistols offer more practical value at lower prices.

Practicality debates come up often. The size and weight rule out everyday carry for most people. Users generally treat it as a range gun or a centerpiece of a collection rather than a utility firearm, and within that context the reviews are largely positive. Aftermarket grips and sights get mentioned as easy ways to personalize it.