Caliber: 6 mm · Blowback: Yes · Speed: <300 fps · Weight: 640 g · Hop-Up: Yes · Magazine capacity: 22 BBs · Internal barrel length: 87 mm · Model: G19 Gen.4 · Shooting mode: Semi -automatic Recommended gas: ABBEY Predator Gun Gas 144a IMPORTANT: the use of high pressure gases other than the recommended gas will cause damage to the gun not covered by the warranty