Yep, that is exactly the chamber end of the barrel on these two. They were laying on the ground in the dustbowl along with a bofors barrel. They have now been moved to the paved compound, and I'll get some grease onto them.
I found a barrel jacket a few years back along the lines of what the 25 pdr has, except smaller. It always puzzled me what it was for. I'll post photos when I get back to that yard again.
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