Heckler and Koch Slimline Stock Features The Heckler and Koch Slimline stock is a retractable buttstock newly developed from HK in Germany built to fit all commercial and mil spec AR-15 and M16 buffer tubes without special adapters. Because it is the same stock issued on specialized HK 416 and MR556 rifles it brings an authentic touch of HK engineering to any compatible AR platform build. The black polymer construction keeps the stock lightweight while standing up to regular use and handling in the field or on the range. Its slim profile reduces bulk compared to bulkier retractable stocks which can matter for shooters who prioritize a streamlined overall rifle silhouette. Marked with the HK logo the Slimline stock gives builders a recognizable detail that signals genuine Heckler and Koch design rather than a generic aftermarket part. It is compatible across the HK416 HK MR556 MR556 A1/A4 and standard AR-15 and M4/M16 platforms making it a versatile option for a range of builds. Shooters looking to replicate the feel of a factory HK rifle on their own AR-15 will appreciate the direct fitment and familiar retraction mechanism. This combination of authentic design and broad compatibility makes the Slimline stock a worthwhile upgrade for sale at GrabAGun. Heckler and Koch Slimline Stock Specifications Manufacturer: Heckler and Koch Model: Slimline Compatible Hosts: AR-15 M16 HK416 HK MR556 M4 Color: Black Material: Polymer Stock Description: Retractable Available At: GrabAGun