Thompson vs. M3 Grease Gun mags

Chuck · October 13, 1999, 12:37 PM

Looking at the rear of the mag (you'd see primers from this view), are Thompson mags wider than Grease Gun mags?

Chuck

James K · October 15, 1999, 03:02 PM

The Thompson mag runs .975", the M3 Mag is .980" at the magazine body, but the top reinforcement is 1.075".

They are not interchangeable, and one can't (feasibly) be made from the other. Also, the feed is different, the Thompson being a true double column mag and the M3 a double column but single feed.

Jim

Chuck · October 19, 1999, 06:24 PM

Thanks!

October 13, 1999, 12:37 PM	#1
Chuck Member Join Date: December 16, 1998 Location: Cupertino, CA, USA Posts: 26	Looking at the rear of the mag (you'd see primers from this view), are Thompson mags wider than Grease Gun mags? Chuck

October 15, 1999, 03:02 PM	#2
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	The Thompson mag runs .975", the M3 Mag is .980" at the magazine body, but the top reinforcement is 1.075". They are not interchangeable, and one can't (feasibly) be made from the other. Also, the feed is different, the Thompson being a true double column mag and the M3 a double column but single feed. Jim

October 19, 1999, 06:24 PM	#3
Chuck Member Join Date: December 16, 1998 Location: Cupertino, CA, USA Posts: 26	Thanks!