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Old March 4, 2009, 02:11 PM   #14
PetahW
Senior Member
 
Join Date: September 19, 2008
Posts: 4,678
2. What is the thumb notch? Is that the little notch cut below the center line of the bolt on the left side? - Yes

What is it for? - Clearance for the shooter's thumb, when pushing down a clip-full of ammo, out of it's stripper clip, into the magazine - a wartime speedloading. The clip lower end fits in the eared slot in the leading edge of the rear receiver ring.

BTW - I can see the doors clearly now (to my nursing home) (Thanks, JK)

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