Up the barrel of a Decommissioned gun.

HikingVet@lemmy.sdf.org to pics@lemmy.world – 55 points –
8

I've been looking at this for 30 minutes expecting to see james bond

That's very interesting; it seems to have a progressive twist rate. I assume that this is from a large bore armament of some kind? I believe that gain twist is sometimes (usually?) used on artillery. (See: https://www.youtube.com/watch?v=KI-\_CtmOzFs)

Rifiling can't have too tight of a twist or it will cause overheating, jams, and other negative effects on the rounds. The same twist is (at slightly different profiles) used on most modern firearms and artillery.