Curious about the plain versus grooved barrel. As mine is very late production, is it a deleted milling process, early vs. late? Or are the little 'ribs' to aid in heat transfer to cool the barrel more quickly?Quote:
Originally Posted by BrianQ
T
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Curious about the plain versus grooved barrel. As mine is very late production, is it a deleted milling process, early vs. late? Or are the little 'ribs' to aid in heat transfer to cool the barrel more quickly?Quote:
Originally Posted by BrianQ
T
I'm referring to the barrel on the right.
T
So, you mean the machining marks in the barrel? The chisels leave that because of the machine screw feed that moves the headstock along at a measured pace. It's just a matter of an extra run to remove those rings after the barrel reaches correct outside diameter...time. If that's what you're referring to...
Yes, that's what I meant; an extra milling step removed to speed things along.
T
Not that it was poor machining, I even like the look. Our peacetime C7 rifles have the same machine marks.
I get those marks on my lathe whenever the bit gets dull. Pretty sure they didn't have carbide tooling back then, could be the bit went dull or the coolant/lube flow got interrupted...
Russ
Sometimes the angle of the chisel will effect it too.
Used to turn drums and rotors . We'd do quicker / deeper cuts to get the right shape , then do a final pass of a shallow cut at a slower feed to smooth it up . Same thing here .
Chris
It also looks like the left one has been refinished. The sand has smoothed the edges some.
C.C.N.L #371, page 16. For some barrel manufacturers, early barrels were ground smooth, later barrels were not.
OP, Nice carbine. Rear sight not original.