Airsoftpro TDC Hop-Up Adjuster - for 26mm outer barrels

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TDC stands for "Top Dead Center". A term that is used with engines and expresses the position when the piston in the cylinder is in its maximum (highest) position. In airsoft, this refers to a device that is able to press continuously (usually by means of an adjusting screw) on top of the Hop-Up chamber arm. To form its upper limit (TDC) without unwanted will. In addition, the control is more sensitive, smoother and usually with a larger range than with conventional lever control.

AirsoftPro TDC is a simple device suitable for a wide range of airsoft sniper rifles. By turning the ring, it adjusts the pressure of the chamber arm and adjust BB trajectory. It adjust Hop-Up. The device provides the user with greater accuracy and comfort than adjusting with a screw or lever. There are two types on offer, which differ in length, location of the fixing screw and the lower arch for different barrel diameters. See table below.

TDC device is made of aluminum alloy on precision CNC machines. Has two main parts. Base and a control ring. It is placed on top of the outer barrel. Just above the Hop-Up chamber. The low profile does not interfere with large riflescopes. TDC is not primarily supported by weapon manufacturers and cannot simply be attached and bolted. During installation, it is therefore necessary to partially disassemble the barrel, measure the position of the chamber arm and drill a hole in the outer barrel exactly from the above. The adjusting screw of the TDC device passes through this hole. By turning it, its length changes and it raises or lowers the chamber arm.

In most cases, the TDC must be glued on the top of the barrel with the super glue. The package includes an M3x10 screw, which can be used to screw the device to the chamber via the barrel. This screwing is logically better than gluing, however, only a few original chambers have a threaded hole. A typical example is the chamber for MB01/04/05/06/08/13 Well. The newer AirsoftPro chambers also have this thread on their upper side and are compatible with TDC.

Spirit level is not only for more accurate installation of the device, but is also suitable for shooting. Tilting the weapon to the left or right will cause the bullet to bend and therefore less accurate. A glance at the spirit level can correct this mistake.

Specs:

  • Full metal construction
  • Original design
  • Made on precision CNC machining
  • Rounded edges to avoid getting caught of the gear
  • Sensitive regulation (1 full turn = stroke 0.5 mm)
  • Locking the position of the adjusting ring - 26 positions per turn. One position has stroke 0.02 mm.
  • Built-in spirit level
  • Able to screw to some chambers
  • Suitable for 27-30mm outer barrels

TDC models:

Name Product code Dimensions Weight Approximate diameter of the outer barrel Axial distance of the fastening and adjusting screw
26mm TDC Hop-Up regulator ASPRO451 46,8 x 17mm 15,71 g 26 mm 30 mm
30mm TDC Hop-Up regulator ASPRO450 36,5 x 17mm 12,33 g 30 mm 5 mm

The TDC adjusting screw must pass through the outer barrel at the top of Hop-Up arm. Thoroughly measure where this arm is located in the barrel and drill vertically hole from above. Use a drill with a diameter of at least 3mm, optimally 3.5-4mm. Bigger hole is not an issue. If you glue the TDC to the outer barrel (in most cases in fast glue), then just one hole. If you are going to screw the TDC (typically for the Well MB01), then we drill two holes - see table above - axial distance of the fastening and adjusting screw.

Copatibility:

Brand Model TDC recommended type
A&K M24 30 mm
ASG McMillan M40A3 30 mm
APS/Hakkotsu APM40A3 30 mm
CYMA CM.700, CM.701, CM.703, CM.706, CM.707, CM.708 30 mm
CYMA CM.702 26 mm
Double Eagle M40A3 30 mm
E&C L96 30 mm
JG BAR-10 / BAR-10G 30 mm
Modify MOD24 26 mm
Novritsch SSG10 26 mm
S&T M40A3, M40A5 30 mm
Snow Wolf M24 26 mm
Specna Arms SA-S02 CORE 30 mm
Tokyo Marui VSR-10  / VSR-10 G-Spec 30 mm
Well MB01, MB04, MB05, MB06, MB08, MB13, MB14, MB15 26 mm
Well MB02, MB03, MB07, MB09, MB10, MB11, MB12, MB16, MB17 30 mm
Well MB4401, MB4402, MB4403, MB4404, MB4405, MB4406, MB4407, MB4408, MB4409, MB4410, MB4411, MB4412, MB4413, MB4414, MB4415, MB4416, MB4417, MB4418 30 mm
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