Retaining Ring for the Floating Closure (sold separately). Together with the Floating Closure (not included) is used as a forward open closure for all 38mm Aerotech Hardware. May come with either silver or black anodizing.

This ring is also a part of 38 Reload Adapter System (38RAS) and you do not need it separately if you have the 38RAS or plan to buy it.

NOTE: The single-piece 38mm Open Closure is discontinued and you need 38FCRR (this product) and 38FFC (available separately) instead of the discontinued forward closure.