The MP5K, a super-compact variant of the MP5, is lightweight, smooth shooting, and nimble in the hands. It’s sort of akin to an AR-15 pistol in that regard, but chambered in a handgun caliber instead of something like 5.56.  But as ARP fans will tell you, while the platform is easy to conceal, handling lacks a little.  On that note, here are 3 ways you can upgrade your MP5K...

It’s not here yet, so you’re ahead of the curve, but Zenith Firearms is on the way to releasing its new ZF9 platform, a fully-bufferless, roller-delayed 9mm PCC engineered for precision and versatility. Here’s just about everything you need to know about it. Smooth, Roller-Delayed Action First, the ZF-9 is completely bufferless, unlike the majority of other sporting rifle...

There are three main action types you can choose from if you want to build a PCC. These are direct blowback, gas impingement, and roller delayed blowback. Gas impingement and roller delayed PCCs are more reliable than direct blowback models, and this short post will shed some light on the relative virtues of roller delayed blowback when compared to gas impingement.  Super...