HK 416, MR556 Factory German E2 Rear Stock Latest HK German Stock For All HK 416,MR556 Rifles.

The HKE2 Buttstock fits MILSPEC buffer tubes (receiver extensions) for M4/AR15 type weapons and has the concave style removable buttpad installed.
HK E2 Stock Features:

Ergonomic cheek weld for improved firing position
Each stock includes MR556 take down tool and tightening tool
Two waterproof compartments for storing 6 batteries (DL-123 or equivalent sized)
Twist-off padded rubber buttplate
Multiple sling attachment points
Multi-position adjustable/retractable (depending on buffer tube)
Requires Mil-Spec buffer tube for install.