Categories All About Guns A Tale of Two Sterlings: Mk.4 (open bolt) vs Mk.6 (closed bolt), First Impressions Post author By Grumpy Post date September 8, 2026 No Comments on A Tale of Two Sterlings: Mk.4 (open bolt) vs Mk.6 (closed bolt), First Impressions ← PTR Vent Suppressor: 3D Printed Titanium Foam → Palmetto State Armory Rock 5.7 – Review and Range Footage Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ