Bought a new RMRcc off Amazon for my 19MOS. Serial number checks out but I'm worried it may have been used based on the scuffing the outside of the button here and
FAQ - OPSol® Mini-Clip™
Amazon.com: Opsol Mini Shell Adapter
THE SHORT ANSWER TO HOME (OR PERSONAL) DEFENSE – PART 2 | Guntoters
OpSol Mini Clip Mini Shell Adapter for Mossberg 500/590 38399
OPSol Mini-Clip™ 2.0 Flex™ - made in USA - fits 12 ga Mossberg 500 590 & Mav 88 736902383995 | eBay
OPSol Mini-Clip 2.0 Flex Adapter for Mossberg 500/590 for sale online | eBay