The AP9A3S is the most advanced of our world famous STRIBOG line. Compact and concealable, yet extremely controllable due to low recoiling semi-locked, roller delayed blowback system, which is robust and simple for reliable operation and longevity. AP9A3S is extremely versatile gun thanks to high degree of modularity and wide range of accessories mounting options. Upper receiver is equipped with M-LOK slots as well as picatinny rails, threaded barrel allows for instalation of muzzle devices, such as factory muzzle brake, or suppressors. CS version, equipped with collabsible, multi position stock allows for rapid reployment while maintaining compact dimensions while remaining robust and secure.FS version, equipped with folding stock, provides compact dismensions when folded but sturdy support when deployed.