The mount of the Wolverine PBS-1 works with the rifles existing front sight block pin to help prevent loosening under a heavy firing schedule. It with two different sized external locking collars a swap of the collar and thread insert gives makes it a versatile silencers. the Wolverine PBS-1 features a detachable front cap. This lets you change out the front cap simply and quickly. Should you drop your suppressor and damage the front cap or have an unfortunate baffle strike you wont need to send it back to the factory for lengthy repairs. The Wolverine PBS-1 removable front cap is interchangeable with the Sandman front caps. *Note- Works with multiple calibers up to 7.62x54R. The Wolverine ships with a 14L thread insert.