The Top 5 MP5 Upgrades

Intro and MP5 / AP5 Platform Overview

The discussion centers on the top five upgrades for MP5-style firearms, including MP5 clones and AP5 variants. Several examples are on the table: a personal AP5, an HK SP5 belonging to the camera operator, and additional AP5 models from Century Arms. The hosts plan to move from muzzle to brace or stock, covering practical enhancements rather than cosmetic changes. They note that Century imports the MKE-made AP5 series and that these guns follow the original MP5 technical data package, using original machinery and metallurgy. The goal is to show how to refine the roller-delayed 9mm platform while keeping compatibility with common MP5-pattern parts and accessories.

Muzzle Devices, Suppressors, and Round-Count Reliability

The first upgrade category is the muzzle device. The hosts compare the original MP5-style flash hider with modern suppressor setups, emphasizing how quiet and smooth a suppressed 9mm roller-delayed gun can be. Century’s AP5 ships with a tri-lug adapted flash hider, allowing quick-attach suppressors on the classic tri-lug interface, while still retaining 1/2x28 threads. This makes it possible to run thread-on cans like the HuxWrx (Hux Works) Cache 9 suppressor. They stress that recoil is already soft due to the roller-delayed action, so the muzzle device is more about sound and handling than recoil control. One AP5 has approximately 15,000 rounds through it, mostly steel-cased Red Army Standard ammunition, still running on original components such as extractor and firing pin, which is notable for this platform.

Handguards, Rails, and Mounting Lights

Moving back from the muzzle, the conversation shifts to handguards and rails. The standard polymer MP5-style handguard with the classic triangular profile is described as functional, keeping heat away from the hand and protecting the barrel. However, many users want mounting options for accessories like lights, pressure pads, and foregrips. Century offers AP5 packages that include a Magpul M-LOK handguard, with versions sized for the AP5P and AP5M, including a stubby model with a front lip to help keep the support hand in place. Accessory mounting systems such as M-LOK or KeyMod are highlighted as important for adding lights and grips. The hosts emphasize that these upgrades let shooters adapt the roller-delayed platform to modern use without sacrificing its original design characteristics.

Magpul, Knights, and B&T Rail Options

Several specific rail and handguard options are compared. One AP5 is fitted with a Knights Armament rail, which offers a more traditional, older-style look and full Picatinny mounting surfaces. Another build uses a slim B&T rail that is lighter and less bulky while still providing Picatinny attachment points. The Magpul M-LOK handguard is noted as more affordable, with good ergonomics and modularity. The hosts mention that Classic Firearms has previously given away AP5s equipped with the Knights rail, underscoring how sought after that setup has become. On one HK SP5, a SureFire Scout Mini light is mounted to the rail with a pressure pad positioned along the side, and cable routing is managed through an angled foregrip to keep it tidy. These examples illustrate how different rail systems support lights, switches, and grips while allowing users to tailor the gun’s feel and weight.

Optics and Mount Choices with Co-Witness

The third major upgrade area is optics and optic mounts. The hosts compare a minimalist, low-profile optics mount to a traditional claw mount that clamps onto the MP5-style receiver. They discuss the practical concern of a dead optic battery during shooting and demonstrate continuing to fire using the iron sights. One mount allows a 100% co-witness between the red dot and the factory diopter sights, which is highlighted as a significant advantage. This setup lets the shooter transition immediately to irons without removing the optic if the battery fails. The focus remains on mounts that maintain reliability and sighting redundancy on MP5, AP5, and HK SP5 platforms rather than on specific optic brands, emphasizing co-witness capability and secure attachment to the roller-delayed receiver.