This fixed barrel spacer allows for more flexibility when using the banish 45.The fixed barrel spacer replaces the spring inside the nielsen device in the banish 45 and should only be used on a fixed barrel firearms.Most commonly, fixed barrel spacers are used on hosts such as pistol caliber carbines and subguns such as sig mpx, cz scorpion, and kriss vector.Model: Fixed BarrelFinish: Black Anodized