AirsoftPro TDC hop-up regulator, for 30mm outer barrels

TDC stands for “Top Dead Center”. The term is used in engines to describe the highest possible position of the piston in the cylinder. In airsoft, it refers to a device that is able to continuously press (usually with an adjustment screw) the top of the hop-up chamber lever. This creates a clear upper limit (TDC) for the lever, thus avoiding unwanted movement. In addition, the adjustment is more sensitive, smoother and usually wider than with traditional lever adjustments.

AirsoftPro's TDC is a simple device that fits many airsoft precision rifles. By turning the knob, the pressure on the chamber lever is changed and the bullet trajectory, or hop-up, is adjusted. The device offers the user greater accuracy and convenience than traditional screw or lever adjustments. There are two models available, which differ in length, location of the mounting screw, and lower arch to match the barrel diameter. See the table below.

The TDC device is made of precision CNC machined aluminum alloy and consists of two main parts: the base and the adjustment ring. The device is placed on the outer barrel, just above the hop-up chamber. Its low profile does not interfere with larger scopes. The TDC is not usually pre-installed on guns and cannot simply be attached and screwed into place. Installation therefore requires partial disassembly of the barrel, measurement of the hop-up lever position, and drilling a hole in the outer barrel exactly above the lever. The TDC adjustment screw passes through this hole. By turning the screw, its length changes, raising or lowering the chamber lever.

Most often, the TDC must be glued onto the barrel with instant glue. An M3x10 screw is included, which can be used to screw the device through the barrel into the chamber. Screwing is naturally a better method of attachment than gluing, but only a few original chambers have a pre-threaded hole. For example, Well MB01/04/05/06/08/13 chambers and new AirsoftPro chambers already have such a thread, making it easy to install the TDC.

A spirit level not only makes it easier to accurately set up the device, but also to shoot. Tilting the gun to the left or right causes the bullet to curve to the side and become inaccurate. With the help of a spirit level, this error can be easily corrected.

Features:

• Precisely CNC machined
• Rounded edges to avoid snagging on equipment
• Sensitive adjustment (1 full turn = 0.5 mm movement)
• Lockable adjustment position of the adjustment ring - 26 steps per revolution, single step adjustment movement 0.02 mm
• Integrated spirit level
• Can be screwed to some of the chambers, others are attached with instant glue
• Suitable for 27-30 mm outer pipes

AirsoftPro TDC models

Compatibility table:

https://www.youtube.com/watch?v=K_bmVO23_eE

https://www.youtube.com/watch?v=MvgpznoHlZ8