HKP Blog
The HK91 and G3 ; A Battle Rifle Legend and How to Upgrade Yours
Few rifles have left as large a mark on military history as the Heckler & Koch G3. Known for its rugged reliability, powerful 7.62×51 NATO chambering, and the unique roller-delayed blowback system, the G3 became one of the most widely adopted battle rifles of the Cold War era. Today it remains a favorite among collectors, shooters, and enthusiasts who appreciate classic military engineering paired with modern upgrade potential.
Whether you own an original HK91, a licensed variant, or a
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16th Mar 2026
MP5 Stocks: Fixed, Retractable, Folding. Know the Differences and Which One Is Right for You
Few firearm platforms are as instantly recognizable as the MP5, and a big part of that iconic profile comes down to the stock. Fixed. Retractable. Folding. Each option changes how the gun handles, how it looks, and how it fits your intended use.
If you’re building, restoring, or upgrading an MP5 or MP5 clone firearm, choosing the right stock isn’t just about aesthetics. It’s about ergonomics, mission profile, and legality.
Let’s break down the three main MP5 stock types t
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10th Feb 2026
HK 91/G3 Overview
Learn about this iconic rifle:
The Heckler & Koch G3 is a rugged 7.62×51mm NATO battle-rifle built on a proven roller-delayed blowback system — a workhorse adopted worldwide, known for simple, reliable mechanics, modularity, and legendary military pedigree.
The HK91 variant is the semi-automatic version that has been converted from the G3 platform.
Specs:
Caliber: 7.62×51mm NATO (standard).
Operating system: Roller-delayed blowback.
Standard barrel lengths: ~16.5–20&
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5th Nov 2025