HKP Blog

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 …

What to Expect With Our New Compliance System We’ve updated our California checkout process to make compliance simpler and built directly into checkout. If you enter a California shipping address, you may see a quick verification step. This helps us meet California’s updated requirements while keeping the ordering process as clear and predictable as possible. HK USA has adjusted its direct shipping approach for California customers. HK Parts operates independently and maintains its o …

Heckler & Koch UMP: Lightweight, Rugged, and Purpose-Built Performance When Heckler & Koch introduced the UMP (Universal Machine Pistol), it wasn’t designed to be flashy, it was engineered to be durable, reliable, and cost-effective, without sacrificing HK’s legendary performance standards. Built as a modern alternative to the MP5, the HK UMP quickly earned its place with military, law enforcement, and civilian enthusiasts who value simplicity, strength, and real-world usabil …

Few pistols in the modern striker-fired market carry the same reputation for precision engineering and duty-grade reliability as the Heckler & Koch VP9. Since its release, the VP9 has firmly established itself as one of HK’s flagship sidearms built for professionals, refined for enthusiasts, and engineered to outperform in every measurable category.    A Legacy of German Engineering  The VP9 (“Volkspistole”) continues HK’s tradition of innovative pistol …

The HK MP5 platform, including variants like the SP5, MP5K, SP5K, and even the MP5 22LR, enjoys immense popularity for its reliability and iconic style. Choosing the right trigger is important depending on your application. Let’s break down the differences. Basic Functionality Single‑stage trigger: One continuous pull from rest to break. There may be some pre‑travel or creep depending on the design, but functionally you pull and it breaks at the set weight. Reset is a single, usually sho …

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& …

What an MP5 Parts Kit Is (and Isn't) An MP5 parts kit bundles key subassemblies and small parts into a single package. Purchasing a parts kit saves time and money versus sourcing components individually.  Most importantly, parts kits are comprised of verified-compatible components thereby taking the guesswork out of the game. But parts kits are not firearms, because kits do not include a formed receiver. [1][2] Parts kits offer immense flexibility, not only in overall configuration, but in …

Why Does M-LOK Take the Win? To incorporate Picatinny mounting points in a handguard design, material must be added, creating additional weight and bulk. Conversely, adding M-LOK attachment points requires the removal of material, allowing the handguard to retain its outer dimensions while reducing weight. Slimmer grip diameter Better heat dissipation Lighter overall weight Time for a Qualifying Statement And by time, we mean high noon, 12 o’clock, right on top. Although M-LOK is, in our …

Do You Know What Thread Pitch Matches Your HK Barrel? When upgrading or modifying your HK (Heckler & Koch) firearm with a suppressor, compensator, or muzzle brake, the most important detail is the barrel thread pitch. The wrong threads can cause unsafe alignment, damage, or failure. This page lists factory thread pitches for popular HK models, plus common US-threaded alternatives and adapter tips. On this page What Is Barrel Thread Pitch? HK – VP9 / VP40 Series HK – P30 Series …

HK parts x s5 tactical G36C Parts Kit Build Guide If you have been looking to put together a proper HK G36C build, this is the starting point. The HKP G36C Parts Kit gives you the core components pulled straight from the G36C pattern. Pair it with the S5 Tactical SG-36 Receiver and you have the bones for a reliable, compact 5.56 rifle that runs clean and is easy to maintain. This guide covers the essentials, what to watch for, and a few upgrades worth adding from the start. HKP G36C Parts Kit …