Kahr Arms Thompson M1

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MSRP
$1,334.00

Quick Overview

Thompson M1921 and M1928 submachine guns were delayed blowback operated, selective fired weapons, based on Blish principle. Blish patent described a delayed blowback breech system in which a sloping metal wedge interlocked the breech block with the gun body. Under high pressure, as when the cartridge fired, the angle of the slope was such that the mating faces jammed solid. As the pressure dropped, the faces were able to slip across each other, the wedge moved up due to the slope, and the breech unlocked. The wartime M1 and M1A1 submachine guns used simple blowback action.
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Kahr Arms Thompson M1

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Firearm Description

Thompson M1921 and M1928 submachine guns were delayed blowback operated, selective fired weapons, based on Blish principle. Blish patent described a delayed blowback breech system in which a sloping metal wedge interlocked the breech block with the gun body. Under high pressure, as when the cartridge fired, the angle of the slope was such that the mating faces jammed solid. As the pressure dropped, the faces were able to slip across each other, the wedge moved up due to the slope, and the breech unlocked. The wartime M1 and M1A1 submachine guns used simple blowback action. All Thompson submachine guns fired from open bolt. The cocking handle was located on the top of receiver on Models of 1921 and 1928, ad on the right side of the receiver on models M1 and M1A1. Separate manual safety and fire mode selector levers were located on the left side of receiver, above the trigger. Barrel was usually partially finned, and on model 1928, fitted with so-called Cutts compensator (not present on M1 and M1A1). Feed was from double-row box magazines containing 20 or 30 rounds, or drum magazines holding 50 or 100 rounds. Box magazines were inserted into the magazine slot from below; drum magazines were inserted into the same slot from the side. Drum magazines were not available for M1 and M1A1 submachine guns.
Furniture included pistol grip, detachable wooden shoulder stock and either a detachable forward grip or a horizontal forearm. Sights on pre-war models included front blade and protected rear, which combined a fixed open-notch blade and raising diopter, which was adjustable for both windage and range (up to 500 yards). Wartime models (M1928A1, M1 and M1A1) used a simple fixed aperture (diopter) rear sight, with or without protecting side "ears".

Additional Information

Gun Type Rifle
Action Semi-Auto
Manufacturer Kahr Arms
Finish Black Matte
Capacity 30+1
Caliber 45AP


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