Pat McGrath provides a review of this 76mm M1A2 Sherman M4 Gun Barrel.

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Thanks!

nice review. very comprehensive.
shame there are no instructions though.

Thanks for putting this up James.

Thanks for the kind remarks Matan.
As well as Saul Garcia I should have thanked Kurt Laughlin, Gary Binder and Mike Canaday for info provided.

Wow this is getting like an Oscar speech

Saul thinks the four rivets on the face of the Muzzlebrake may be post war and looking at wartime photos through a big magnifier I can't see any but the photo quality isn't great. Anybody got definite info?

There are factory photos in Hunnicutt's Sherman showing them (pp 265 and 274) as well as an in-service shot dated 22 Feb 45 (pg 323).

These would be essential as the normal way to boresight guns was to stretch threads over the muzzle, fitting into four grooves engraved in the muzzle face, to form crosshairs. This would not be accessible with a muzzle brake, so the rivets served as bollards to wrap the thread around.

KL

by the way, please tell me I wasn't the only one to read "m1a2" and "sherman" and thought something was wrong here

Pat the pieces you are not sure off are they aiming points?

I'm not sure what you mean by aiming points. If you mean the external gunsight seen in the centre top of this photo from www.usarmymodels.com then no I don't think it's that.