Hosts, Platforms, and Base AP5 Package
Clint from Classic Firearms introduces Adam from Century Arms to walk through the top five upgrades for MP5-style guns, including MP5 clones, the Century AP5 line, and the HK SP5. Several examples are laid out on the table, such as Clint’s personal AP5 and Ryan’s HK SP5, along with other AP variants to show how upgrades translate across platforms. The plan is to move from muzzle to brace or stock, covering each major component in order. Adam explains the base AP5 package: it ships with the classic triangular polymer handguard, a detachable Picatinny top rail, magazines, and a hard case. He notes that many buyers want to unlock the full potential of the roller-delayed 9mm system, which is known for soft recoil and reliability. This opening section frames the discussion as a practical guide to turning a stock AP5 or MP5-style firearm into a more capable, modernized setup without losing the iconic feel.
Muzzle Devices, Suppressors, and Durability
The first upgrade focus is the muzzle. Adam highlights suppressor options like the HuxWrx (Hux Works) Cache 9, emphasizing how well roller-delayed 9mm guns suppress and how pleasant they are to shoot with reduced blast and recoil. The AP5 ships with a tri-lug–adapted flash hider while still retaining 1/2x28 threads, giving owners flexibility to run tri-lug cans or direct-thread suppressors and compensators. They discuss the tradeoff between waiting on suppressor paperwork and immediately enjoying a quieter, more controllable gun once approved. Durability is addressed using a full-size AP5 with over 15,000 rounds through it, mostly steel case Red Army Standard ammunition. Despite the high round count, original components like the extractor and firing pin are still in service, exceeding many expectations for roller-delayed blowback platforms. This segment underscores that the AP5 is not just a fun clone but a robust workhorse capable of long-term use with inexpensive ammo.
Handguards, Rails, and Modern Light Mounting
Range footage shows the AP5 in action, contrasting a relatively simple configuration with a more accessorized build loaded with lights and gadgets. The discussion turns to handguards and rails as the next key upgrade area. The standard polymer handguard is praised for heat management and basic protection, but Century Arms also offers AP5 variants equipped with Magpul M-LOK handguards. These come in sizes tailored to the AP5P and AP5M compact models, giving users modern mounting real estate. With M-LOK or KeyMod, shooters can easily attach weapon lights, pressure pads, and slanted foregrips in ergonomic positions. The hosts explain that this modularity lets owners tailor the front end for home defense, range use, or competition. By moving beyond the classic smooth handguard, the platform gains compatibility with current accessories while maintaining the MP5’s recognizable profile and handling characteristics.
AP5–MP5 Compatibility and Advanced Rail Options
Adam explains that the AP5 is built using original MP5 technical data, machinery, and metallurgy, resulting in very high parts compatibility with HK MP5 components at a more accessible price point. This authenticity means most MP5 aftermarket parts, from small internals to furniture, will fit the AP5. The conversation then dives deeper into handguard and rail choices. They showcase a Magpul M-LOK handguard, a Knights Armament rail system, and a slim B&T Picatinny rail, illustrating different philosophies: lightweight modularity, robust quad-rail style, and low-profile Picatinny. Package offerings that include Magpul furniture are mentioned for buyers wanting a turnkey modern setup. For lighting, they demonstrate a Surefire Scout Mini mounted with a pressure pad, contrasting this sleek arrangement with older HK mag-mounted lights famously seen in operations like the SAS Iranian embassy raid. Cable routing through an angled foregrip is highlighted as a way to keep wires protected and controls intuitive, setting up the transition to optics as the next major upgrade.
Optic Mounts, Co‑Witnessing, and Rail‑Ready Models
Optics and mounting solutions take center stage with a demonstration of a dead-battery optic that still allows accurate shooting thanks to a true 100% co-witness with the MP5-style iron sights. This illustrates the value of low, properly designed mounts. They discuss MK’s base model that features an integrated Picatinny rail machined into the top of the receiver, providing a long, stable surface for mounting a wide variety of optics without needing a clamp-on mount. A Shield-designed clamp mount and micro optic are showcased for their extremely low profile and tight fit, which maintains zero and preserves co-witness capability. This setup is contrasted with bulkier mounts that sit too high and obscure irons. The hosts compare the minimalist Shield configuration to a Trijicon RMR on a B&T mount and to a Knight’s Armament upper with an integrated top rail running EOTech EXPS2 and XPS3 optics, discussing both aesthetics and functional sight height over bore.
Ride‑On Optic Package and Binary Trigger Use
The integrated Picatinny rail on AP5 and MP5-style platforms is shown supporting compact holographic optics like the EOTech EXPS2 and XPS3, underscoring how these classic subguns can be modernized. They introduce a Ride-On optic that has proven durable in testing and will be bundled in a ClassicFirearms.com package, which also includes the Pic rail, magazines, an end cap, a thread protector, and a tri-lug adapter. This creates a ready-to-go upgrade kit for new owners. On the range, one rifle is equipped with a Franklin Armory binary trigger, demonstrating how it dramatically increases double-tap speed while remaining controllable. The hosts note that stock AP5, MP5, and SP5 triggers and safeties can feel mushy or awkward, especially the polymer safety levers. An upgraded metal safety from HK Parts is highlighted as a worthwhile improvement, offering more positive engagement and better ergonomics, and serving as a bridge into a broader discussion of trigger and control upgrades.
Upgraded Safeties, Triggers, and Grip Modules
The aftermarket metal safety from HK Parts is examined in detail, showing how it replaces the factory lever with a more robust, tactile control that is easier to manipulate under stress. The Franklin binary trigger’s operation is demonstrated: in semi-auto it offers a smooth pull with a short, crisp reset, while in the third position it effectively fires on both pull and release, sending the hammer twice with minimal let-off for extremely fast pairs. They emphasize that understanding this behavior is crucial for safe, effective use. Grip modules are another upgrade area, and the hosts note that the grip frame itself is not the serialized firearm, making swaps straightforward. The AP5 grip is more contoured and ergonomic, with pronounced molding and texturing, whereas the SP5 grip is sleeker and less sculpted. These differences affect comfort for various hand sizes. They also touch on design and manufacturing changes from the original MP5 to the SP5 and compare overall fit and finish between HK and AP5 before stressing how much a brace can transform shootability.
Braces, Compact AP5P/AP5M Variants, and Sling Use
Braces are presented as a major functional upgrade, adding a third point of contact for improved stability, faster target transitions, and better accuracy at extended pistol-caliber ranges. SB Tactical braces and modules are highlighted for their broad interchangeability across HK and AP5 variants, including side-folding options that preserve the compact nature of the platform. The hosts then clarify the differences between the AP5P and AP5M compact models. Both share the shorter receiver and handguard profile, but the AP5P includes a threaded barrel with tri-lug and 1/2x28 threads under a flash hider, while the AP5M deletes the external threads, making the barrel about half an inch shorter. The AP5M is positioned as ideal for ultra-compact concepts like a “suitcase gun” and for buyers in states that restrict threaded barrels, allowing them to own an MP5-style firearm legally. Single-point slings are recommended for these compact setups, complementing braces and enhancing control during movement.
Aftermarket Parts, Magazine Finishes, and Closing Thoughts
The final segment broadens back out to the overall aftermarket ecosystem for MP5-style guns. The hosts note that many HK-pattern parts, including rail sections, optics, optic mounts, and even precision trigger components that use G3 internals, will fit the AP5 due to its adherence to original MP5 specifications. Attention then shifts to magazines. German HK magazines are typically blued, while MK-branded mags are produced on original tooling but finished in a parkerized coating. In testing, the parkerized MK mags appear more durable and notably more resistant to rust than the blued HK versions. To combat corrosion on HK mags, one host stores them with Ballistol, while cautioning that this can make them slick during fast reloads. The discussion closes with an appreciation for how enjoyable classic MP5s and AP5s are to shoot, especially once upgraded with the right combination of muzzle devices, rails, optics, triggers, braces, and reliable magazines.
Loading...