Jaeger Precision finds the ATI Airsoft SUB5 Kit is an impressive piece of equipment, often seen in the hands of HPA airsoft players. It's constructed from SLS Nylon PA12 printed components, ensuring durability and precision. The kit features its own trigger board, complete with an electronic safety and selector. It's compatible with Polarstar Drop-In Engines and, more recently, with Wolverine engines, although compatibility with the latter is currently limited. The kit boasts the absolute lowest Line of Sight ever, even including an RMR option. It also includes laser-cut polycarbonate sheets, an adjustable trigger, and is compatible with Classic Army X9 or PTS AR9 Magazines. The kit works well with almost all V2 Rotary Engines. For optimal performance, a barrel length of 130-140mm is recommended, and it comes with a -14mm thread at the front.