RR barrel?

hi:
i've got a no.4 mk.1* longbranch bubba here (1943).
the top of the chamber is stamped with a "star" and a superimposed RR (rolls royce?)the end of the barrel near the muzzle also has the "RR".the barrel is dated 1955.the barrel has a 5 (or so) twist and is sharp but looks pitted and rusted(dark and gritty)also,about 2 inches of the barrel near the muzzle has NO RIFLING!
i'm wondering if the barrel was rewelded or maybe counterbored and who made this barrel.i don't see obvious welding but it might be under the front sight.the only rub is the RR near the crown is after the bored out/missing rifling.the bayonet lugs are there.
any of you guru's have an idea as to wassup...

Welcome to the world of corrosive ammunition and abused and poorly cleaned barrels, do not despair until you clean the barrel with a foam bore cleaner and then shoot the rifle for accuracy.

I had a 1943 Remington 03-A3 with a barrel just like yours and the rifle shot extremely well, you will not know until you try a few different types of ammunition in it, stay away from anything with a boat tail design.

The wear at the muzzle end is caused by shooting the rifle in dirty dusty conditions, with the dirt and dust in the bore acting like sand paper.

https://www.milsurps.com/images/impo...9/Page03-1.jpg

https://www.milsurps.com/images/imported/deleted.gif

thanks for the info.
another ?
the "knox form" is threaded part of the receiver where the barrel screws into, right?

Quote:

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Originally Posted by toyboy

thanks for the info.
another ?
the "knox form" is threaded part of the receiver where the barrel screws into, right?

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Not exactly, it's the part of the barrel just ahead of the receiver where the chamber is.