Here's the EXACT text from the
HANDBOOK OF ORDINACE MATERIEL
ST 9-159

US ARMY ORINANCE CENTER AND SCHOOL
ABERDEEN PROVING GROUNDS
MARYLAND

SUBMACHINEGUN, CAL .45, THOMPSON, M1 AND M1A1
1005-672-1754 (M1)
1005-672-1755 (M1A1)

CLASSIFICATION.............LIMITED STANDARD
WEIGHT, WO/EQUIPMENT.......10 LB 7 OZ
LENGTH:
OVERALL..................31-3/8 IN
BARREL...................10-1/2 IN
OPERATION..................BLOWBACK
FEED.......................MAGAZINE (20 OR 30RD)
COOLING....................AIR
AMMUNITION TYPE............BALL, TRACER, AND DUMMY
MUZZLE VELOCITY (BALL
234 GRAIN BULLET)........920 FPS
MAXIMUM RANGE (BALL
30º ELEVATION)...........1,960 YD
RATE OF FIRE...............700 TO 800 RD/MIN
DIFFERENCES AMONG MODELS:
M1A1 DIFFERS FROM M1 ONLY IN HAVING A
FIXED FIRING PIN IN PLACE OF MOVABLE
FIRING PIN AND HAMMER.

SNL A-32
TM 9-215

SUBMACHINEGUN, CAL .45, THOMPSON, M1928A1
1005-672-1740

CLASSIFICATION.............LIMITED STANDARD
WEIGHT, WO/EQUIPMENT.......10 LB 9 OZ
LENGTH:
OVERALL..................33-7/8 IN
BARREL...................10-1/2 IN
OPERATION..................DELAYED BLOWBACK
FEED.......................MAGAZINE (20 RD)
COOLING....................AIR
AMMUNITION TYPE............BALL, TRACER, AND DUMMY
MUZZLE VELOCITY (BALL
234 GRAIN BULLET)........920 FPS
MAXIMUM RANGE (BALL
30º ELEVATION)...........1,960 YD
RATE OF FIRE...............600 TO 700 RD/MIN
DIFFERENCES AMONG MODELS:

TM 9-1215


and by the way, the pictures in the book show that only the M1928A1 had the cutts compenstaor.

Hah!


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"Victory at any Price!"

SS-Panzergrenadier

I thought Waffen would have been all over Burgen's original post... but, he's nowhere to be seen http://www.pcgamers.net/ubb/wink.gif

Hi Burgen, I nice poster.

Kraut Killer-
(1923) The 1923 model was a very rare gun because did not sell well. Its target market was for the military, it had options like a sling, bipod, and bayonet. No conpensator due to the bayonet option. Also it wasn't the only model that took the drum mag. They tried useing a higher powered .45 round made by Remington and it slowed the ROF to around 400 rounds a minute. This model is very rare.

(M1A1) The U.S. entered the war with a limmited amount of the 1928A1 (M1A1) which had the charging handle on top and could take both kinds of mags of the time, and of coarse compensator.

(M1) Because of the mass production demand, in 42 they started producing the M1. That was the simplified version. They got rid of the actuator, breach oiler, barrel fins, compensator and a couple other things. It also had a full-auto/semi-auto selector. It had a side charge handle and simplified sights. This model could only take the box mags. Soldiers didn't get this one until the later part of 43.

If you're going to post facts, no matter how dumb or brilliant they are, at least have them right.

The M1A1 Thompson is the early version with the cutts compensator and the finned barrel.
It also had the charging handle on top of the reciever and was the only model that could use the drum mag.

The later version of the Thompson was the M1. The action was simplafied and the charging handle was moved to the side. By the time of Normandy they had the 30 round clip As Well. From this point on they were both common and interchangable. After all a Thompson is a Thompson.

The commandos and the commonwealth forces had the M1A1.