Eeyup! Almost every modern gun has that sort of rifling on the inside--shotguns being the primary exemption (hence their short firing range). If I recall correctly, the Germans pioneered rifling in various types of hunting weapons around the time of the American Revolution. General Washington decided to incorporate the design into his troops' weapons, giving them a distinct advantage!
I'm having trouble identifying the characters. I know that's Bond. That's obvious. And I also know the Griffin is Francisco Scaramanga (The Man with the Golden Gun). I'm guessing the pony with the red mane and silver grin is Jaws (The Spy who Loved me/Moonraker). The pony on the bottom left could be M, if I'm not mistaken. And I'm guessing that the mare with the purple hair is Miss Moneypenny? But, I don't know the others. Could you elaborate?
But other than that, This is a nice piece of artwork. Great job.
The swirly thing is supposed to be the grooves in the barrel of a gun. (They put spin on the bullets to help keep them straight.) I've seen every James Bond movie ever made and I'm embarrassed to admit that I didn't know that until I saw the American Dad Bond parody!