HB Industries Kuna Short Stroke Buffer Kit

The HB Industries Short Stroke Buffer Kit is the most impactful Kuna reliability upgrade available. The longer HBI buffer shortens the bolt's rearward travel, and the included +20% recoil spring compensates for the reduced spring load. The combination lightens recoil impulse, speeds reset, and, most importantly, closes the gap that lets a live round or spent case drop behind the buffer in the factory configuration, a documented Kuna malfunction that has bricked guns mid-string.

HBI cautions that reliability is only guaranteed with factory or HBI fire control components; pairing this buffer kit with a Nexus AR-FCG lower has produced mixed results in user testing. On factory-FCG Kunas this is a buy-first upgrade.