It's the stock Czech bipod that attaches to the bayonet lug. I was using a mix of ammo: Golden Tiger, Wolf/Brown Bear, and Red Army, 122-124 gr. As a test I loaded the mags with a random mix of brands and HP, FMJ, and SP, and wasn't keeping track. No problems feeding (or at all). Big improvement with the bipod without adjusting the sights. Shooting so much and so steadily, I may have compensated for any change in POI by taking cues from previous shots. I like to shoot offhand the most and develop that, but the bipod is a nice change of pace.