It is a rifle barrel.
New info- The barrel is a shooter. Initial load data is as follows:
46 Grains H380 (too hot)
140 Grain Nosler Ballisic Tips
Lapua Brass
Federal LRM primers
First, 46 Grains of H380 in this rig is too hot. (BTW, this is a very sweet rifle, light and maneuverable, but its lightness lends toward heavier recoil) Signs of pressure included flattening of the primer and cupping of the primer around the firing pin. I think that this batch of H380 is hot, because I have had to back off of my 22-250 loads a full grain to get similar performance to my last batch (good lesson!!!) After cleaning, shooting, cleaning, shooting, putting a bandaid on my scope cut (ouch), and following this routine, the barrel really started to settle in. First groups were an unimpressive 1.5", but after about 20 rounds, and a lessening of the charge, the two last groups dropped into the 9s. This is without any load workup, neck turning, or other such necessary stuff. Plus, after a few passes with JB, the bore shined like a custom, and fouling wasn't a problem. 3 Patches of CR10 and I was done (after a little hoppes to get the powder out)
I just bought some Hornady 120s and some H4895 to work up a lower recoiling load, and I'll follow up again. Also, I've trued the lapua brass (which doesn't need much), and I'll try a little Varget as well. I'm confident that this barrel will drop into the 5s quickly (can anybody say 4s? We'll see!), and is a real bargain. I fully recommend them, I think that you'll be pleased.