Laylax gives us an overview of their Nineball Non-Recoil 2WAY Outer Barrel NEO for the Tokyo Marui G19 GBB Pistols... "A metal outer barrel that can be attached to the Tokyo Marui gas blowback hand gun G19 series. Stable shooting performance is demonstrated by using a high-rigidity aluminum alloy material and making it a non-recoil specification. By changing the tip of the muzzle, you can choose between the normal shape and the SAS shape to your liking, and it is possible to attach various attachments compatible with 14 mm reverse screws, including our MODE-2 products. In addition, the muzzle mounting part is an M11 positive screw, and attachments of the same size can also be mounted.

What is non-recoil? The outer barrel is fixed and the outer barrel does not short-recoil.
By making it non-recoil, it demonstrates stability, suppresses blurring at the time of launch, and contributes to bullet collection performance! Blowback of the slide is performed as usual."