Cylinder set (Bore-Up) for AK47/AK47S (Variant type) - SHS

It is a complete set of air conditioning + delay cam

Nozzle - 19.7 mm long, aluminum, one O-ring seal

• Cylinder head - Aluminum, funnel rubber stop, two O-rings
• Cylinder - Aluminum, ribbing to improve thermal properties.
• Piston head - material POM - Polyacetal, strong and light plastic, which does not suffer from change of shape (exploding) like aluminum heads. Steel core for screw mounting. Funnel-shaped rubber stop
• head, ball bearing.
• Piston wheel delay cam - polymer

Bore-up is the name for parts that have an extended shape to accommodate as much air as possible. In layman's terms: more air in the cylinder means more pressure in the barrel and thus increased performance of the weapon. Primary are these parts designed for weapons with a longer barrel, or when replacing the basic barrel with a longer one (for example, by extending the inner barrel up to the silencer).
However, bore - up sets need sufficient force to achieve the required power, so it is generally recommended to use M130 and higher springs.

• Compatibility with other sets: NBU Guarder, NBU Systema
• Compatibility with gearboxes: Gearboxes according to the Tokyo Marui standard
• Tried: Classic Army, SHS, Super shooter, Retro Arms, CYMA

Recommendation: The rollers are delivered from the manufacturer slightly dusty on the inside. Prior to installation, we recommend cleaning all parts with silicone spray, polishing with a cloth or paper towel, and then lubricating with silicone or Teflon paste for proper operation.