Nerf sniper-style scar for 16mm barrel

This is a purely cosmetic alteration to the Silly Spigot Scar by Sillybutts, it keeps the same functionality and ease of use as the original, but with a cosmetic restyle to look like the muzzle break found on some snipers (like the Barrett M82A1).

Since this is intended for sniper-like blasters, i included a version with less agressive rifling (6 degrees rotation instead of 12) which is more suited for high-FPS blasters - this version is based on another remix by Isaacdaparrot.

the only hardware required is a rubber 016 O-ring