AIRSOFT GEARBOX & PARTS

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS190): Spring MS190 ---------- 440 - 450 fps (Only apply to AEGs with Spur Gear Set Super Torque Up Ratio ) Please check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS170): Spring MS170 ---------- 415 - 425 fps (Only apply to AEGs with Spur Gear Set Super Torque Up Ratio )Please check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS150): Spring MS150 ---------- 390 - 400 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS135): Spring MS135 ---------- 380 - 390 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS120): Spring MS120---------- 360 - 370 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS110): Spring MS110 ---------- 350 - 360 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring (MS100): Spring MS100 ---------- 340 - 350 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

FPS test on Tokyo Marui MC51 for Prometheus Non-Liner Spring: Spring MS90 ---------- 330 - 340 fpsPlease check AEG Spring Comparison Chart from http://www.airsoftcanada.com

Reinforced piston from Prometheus is made of highly tensile plastic, which absorbs more impact and much more immune to wear and tear in highly upgraded configurations.

Metal piston head with reinforced O-ring and single direction air inlets for less cycle resistance. Metal piston also makes the report much louder when you fire your AEG!

Bearing spring guide prevents spring from building unnecessary tension by twisting and distorting in its seat. This is a highly recommended item for highly upgraded AEG gearboxes.

Standard replacement selector plate. If your AEG is having difficulty registering your semi or full-auto selection, then it could be that the metal contacts on your selector plate have carbonized or are worn out. Simply replace this plate for smooth...

The milled brass cylinder head for version 4 gear box keep the nozzle stroking at the exact center of the cylinder.

Systema Tokyo Marui AUG Cylinder Head (Compatible with SIG550 / SIG551 / SIG552)

This is a highly recommended upgrade for AEGs with lengthened barrels since you will need additional volume of air to propel the BB out of the longer barrel - to avoid back-pressure. These bore-up cylinders actually have the same external dimensions as a...

This is a highly recommended upgrade for AEGs with lengthened barrels since you will need additional volume of air to propel the BB out of the longer barrel - to avoid back-pressure. These bore-up cylinders actually have the same external dimensions as a...

Tighter sealed air nozzle ensures more BB barrel exit velocity.

Tighter sealed air nozzle ensures more BB barrel exit velocity.

Tighter sealed air nozzle ensures more BB barrel exit velocity.