The QSW-06, a Chinese semi-automatic pistol, features an accessory rail under the barrel, commonly known as a Picatinny rail or a similar type of mounting system. This rail allows for the attachment of various tactical accessories. Common accessories that can be attached to such a rail include:

1. Tactical Lights: These are used to illuminate targets in low-light conditions, providing better visibility and target identification.

2. Laser Sights: These help in aiming by projecting a laser beam onto the target, which can be particularly useful in quick target acquisition scenarios.

3. Combination Units: Some devices combine both a tactical light and a laser sight, offering the benefits of both in a single unit.

4. Foregrips: Although less common on pistols, some users might attach a small foregrip for better control, especially in tactical or competitive shooting scenarios.

These accessories enhance the functionality of the firearm, making it more versatile for different operational needs.