Gun Fun: Fostech Outdoors Bumpski Stock

One of my favorite firearm accessories is the Bumpski stock. In these times of limited ammo accessibility, it’s not an addition to my rifle that I’d consider “practical,” but it is hard to beat in terms of range fun. Fostech Outdoors’s Bumpski stock is a billet aluminum stock with two functions. In fixed position, it works just as any standard fixed rifle stock for an AK (it fits both the 47 and the 74, as long as the original stock isn’t an underfolder or side folder). However, the cool function (and the reason they sell like hotcakes) is how it facilitates bump fire. The Bumpski has two main components: the fixed attachment that connects to the rifle receiver, and a butt/shoulder/pistol grip component that slides back and forth over the receiver attachment with the force of recoil.

I’m a cross dominant shooter, and fortunately for me, the Bumpski is ambidextrous. Moving the cheekweld and switching from a right to a left handed trigger bar are the only modifications necessary (which entails using an allen wrench and about 40 seconds of effort) to swap the stock from right handed to left handed function.

To use the Bumpski while in the bumpfire configuration, the shooter shoulders the rifle as they would for regular fire, and places their trigger finger on the trigger bar. During fire, the recoil moves the rifle backward along the stock, when it reaches the end of the stock, it bounces back forward. That forward motion pushes the trigger up against the shooter’s finger, depressing it and initiating the cycle again. This allows the shooter to “pull” the trigger more rapidly than with regular fire, allowing a semi automatic rifle to simulate full auto fire (the Bumpski facilitates fire around 650 rounds per minute – pretty cool, if you have the ammo). Despite the high rate of fire, it is surprisingly easy to control. The rate of fire can also be controlled using the rifle’s forend. (I found it somewhat easier to manage this when shooting a rifle with a vertical foregrip, but it wasn’t what I’d consider a challenge using a standard AK foregrip.)

Running an AK bumpfire style is the fastest way I know to burn through ammo, short of firing a fully automatic, but that novelty makes it an absolute blast. However, if you desire a more practical disposal of your 7.62×39 (or 5.45×39, if firing an AK74), you can still use the Bumpski stock. Simply lock it in fixed position and remove the trigger bar. Voila, standard function rifle.

Before trying out the Bumpski, I had never bumpfired any firearm, so I can testify to the Bumpski’s ease of operation. Check out this post’s video to vicariously enjoy my full-auto fire simulation fun.