Comparing M1 Garand Rear Sight Assemblies

The lock bar type is an older sight. Literally has a wee bar that locks the sight adjustment knobs in place. Later changed(adopted in 1947) to simplify manufacturing.
Buy a copy of Hatcher's Notebook and Hatcher's Book of the Garand. About $30 each at your local gun shop or Amazon. Lots of history of the developement of the rifle and the ammo in the former. More history(ammo chapter is a bit better) and a trouble shooting chapter in the latter. Both are worth every cent. Hatcher's Notebook should be required reading for any shooter.
Go here for free U.S. military FM and TM .pdf manuals. Note the need for the provided UN & PW. FM-23-5 will be the most use to you. Same trouble shooting as Hatcher's book.
http://www.biggerhammer.net/manuals/
 
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