Milled Vs. Stamped M78 Bolt comparison

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Lima
Posts: 9
Joined: Sat Aug 22, 2015 2:02 pm
Location: North East

Milled Vs. Stamped M78 Bolt comparison

Post by Lima » Mon Jun 13, 2016 4:13 pm

Interesting comparison between two M78 bolts.

The one on the left side of the pictures is from a stamped .308, the right side is a milled .308. I always thought they were the same but aside from different bottom profile, they have two key dimensional differences:

1) Forward part of the locking lug is 2x bigger on the milled
2) Slot for the ejector on stamped can take a #39 drill 0.099". Where the milled is bigger, #32 drill 0.116"
Attachments
Bolt 1.jpg
Bolt 2.jpg
Bolt 3.jpg
Bolt 4.jpg
Last edited by Lima on Tue Jun 14, 2016 2:27 pm, edited 1 time in total.

AGG
Posts: 2024
Joined: Wed May 30, 2007 11:32 am
Location: Alabama

Post by AGG » Tue Jun 14, 2016 5:45 am

Thank you for the excellent comparison!!! :D

Tony

DunGoterDid
Posts: 95
Joined: Wed Feb 08, 2012 10:53 am

Post by DunGoterDid » Wed Jun 15, 2016 9:57 pm

The biggest functional difference is that the longer locking lug for the milled gun won't clear the inside of the trunion of a stamped gun. I think a bolt for a stamped gun will work in a milled gun though. Milled M76 .308 bolts are the same as bolts for a milled M78.
Valmets are sweet

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