SILENCERCO DELTA ADAPTER 1/2X28

Description

The SilencerCo Delta Adapter is a dedicated mounting interface designed to connect a compatible suppressor to a host firearm threaded at 1/2×28 — the pitch most commonly found on rimfire and lightweight centerfire barrels. Its purpose is straightforward: give a suppressor a stable, repeatable seat every time it goes on and comes off, without loosening under sustained fire or working itself off from vibration.

The adapter is machined from steel, which matters here because the muzzle of a firearm is a high-stress point. An adapter made from softer material can deform at the shoulder or thread roots over repeated mounting cycles; steel holds its dimensions across a service life that should outlast the host gun itself. The O-ring engagement is the other functional detail worth understanding. Rather than relying on metal-to-metal contact alone to prevent rotation, the O-ring provides consistent drag that keeps the adapter indexed where you set it and reduces the chance of it backing off during firing. This is particularly relevant on semi-automatic rimfire platforms, where the rapid cycling and relatively light bolt mass can transmit more rotational energy to a muzzle device than a bolt-action would.

The AC3 designation places this adapter within SilencerCo’s Delta system. If you are already running a Delta-compatible suppressor, this is the mount that puts it on a 1/2×28-threaded host without requiring any additional adaptors or shims. Installation is direct and the interface is designed to be repeated cleanly each range session.

Shipping and availability: This item must ship to a licensed FFL dealer for transfer.