A good look at the Friction Pro Single Point Hop-Up for AEGs and gas blowbacks by 4UAD Smart Airsoft, the outfit that developed this hop-up for better performance. They say that the Friction Pro hop-up bucking, designed for optimal consistency, ensures a perfectly centered spin axis for each shot. Its unique single-point design and distinct contact patch contour generate sufficient friction to lift BBs as heavy as 0.48 grams, while minimizing the contact surface to eliminate potential errors, thereby producing a flat, consistent, and precise trajectory.