Ares has introduced 3 types of Outer Barrel for their Amoeba AS-01 'Striker' sniper rifles. This particular version is the Spiral Fluted Outer Barrel which adds a very stylish element to the Striker series.
This outer barrel is shorter but it doesn't reveal the tip of the inner barrel. At the end of the barrel is a 23mm CW thread for their mock suppressor. You can also purchase their 14mm CCW thread adapter if you prefer alternative aftermarket parts.