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Please help ID a topcover(?), 3 big pics, dial up warning!

1481 Views 6 Replies 4 Participants Last post by  ontos106
I'm trying to help a buddy figure out what the heck this is. My lame guess is a stripped topcover for something big. I've looked around the web for pictures of a live one but so far no luck.

For reference, overall its approximately 11 and 11/16" long, 2" wide and 2 and 1/2" tall.

Any help would be appreciated, Thanks!

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The part number 7308856 would indicate that it is a "hinge Block Breechblock" with National Stock Number 1015-00-305-0754.
I'm sorry did I forget to mention its for an M40A2, 106mm Recoiless Rifle. A picture appears on page 1-6, FM 23-82, 106-MM Recoiless Rifle M40A2 dated 30 July 1973.
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