An
assembly (1) for a firearm (2). The
assembly includes a
muzzle device (3) configured to be attached to the firearm (2), a substantially tubular
muzzle adapter (9), a substantially tubular attachment
mount (15), a substantially tubular
clutch collar (19), and a device (23) such as a sound
suppressor. The device (23) is releasably attached to the substantially tubular attachment
mount (15) by an attachment device (25). The
muzzle device (3) is configured to be releasably received in the substantially tubular muzzle adapter (9). The substantially tubular muzzle adapter (9) is attached to the substantially tubular
clutch collar (19) for rotation about the longitudinal central axis A together with the substantially tubular
clutch collar (19) with respect to the device (23), to the muzzle device (3) and to the substantially tubular attachment
mount (15) between (i) a locking position, and (ii) an unlocking position.