Product Overview
The Heckler & Koch Slim Line Buttstock for the MR556 is a retractable, adjustable stock designed for the HK416, MR556, and other AR-15/M16 rifles with commercial or mil-spec buffer tubes. Constructed from durable black polymer, it features a minimalist, functional design with a focus on reliability and compatibility.
This would be a great item to put on your MR556 HK pistol, if you register it as an SBR.
