Both are full-auto rated for their specified caliber designation (9 or 45), while also being capable of suppressing 300 BLK subsonic loads. The Octane line is also user serviceable making it compatible with lead projectiles. The Octane series offers superior performance at an affordable price. 

The Octane 9 is rated for 9mm and 300 BLK, while the Octane 45 is rated for calibers ranging from 9mm to 45 ACP / 10mm and 300 BLK. The Octane Series is compatible with all Alpha and pistol accessories. 

It ships with a Spring Retainer and a Piston Spring.