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About COWCOW Spring Set for TM G17 Gen5
The COWCOW Spring Set for the TM G17 Gen5 is a complete set of internal springs for the Tokyo Marui G17 Gen5 GBB. The manufacturer lists the contents as 11 springs by Tokyo Marui's own part numbers, and the set includes a 120% nozzle spring and a 120% hammer spring, which give a stronger blowback than the originals.
The Marui G17 Gen5 is one of the most widely used gas pistols in airsoft, and after many thousands of shots it is typically the springs that lose strength first – showing up as weaker recoil, incomplete cycling or a trigger that feels slack. With a complete set you can give the pistol a thorough service in one go. The reinforced nozzle and hammer springs also give a more pronounced kick without major modifications.
What you get with the spring set
Advantages over replacing individual springs:
- 120% nozzle spring: Returns the nozzle faster and more decisively after each shot, giving a stronger blowback kick than the stock spring.
- 120% hammer spring: Gives the hammer a firmer strike on the magazine valve, which helps consistent gas release – especially when the gas is cold.
- 11 springs by Marui part numbers: The contents follow Tokyo Marui's own numbering (GBB 9-7 and GBB 12 series), so each spring is intended for a specific place in the pistol.
- Coated high-strength spring steel: Made from spring steel with a hard surface coating that prevents corrosion from moisture and gas.
- Made for Gen5: The set is made specifically for the TM G17 Gen5, which has a different internal layout from the Gen3/Gen4.
Maintenance and safety
- Stronger springs need more gas – use green gas or stronger, and be aware that cold gas can give weaker cycling.
- De-gas and remove the magazine before disassembly, and take photos along the way so every spring goes back in its place.
- Screws should be secured with strong threadlocker left to cure overnight, according to COWCOW.
- If you would rather have a full service with spring replacement, our workshop in Aulum, Denmark can do it for you.
Materials
Højstyrke fjederstål med hård coating
Delivery and returns
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Full 14-day right of return with a money-back guarantee. Unused items in unopened packaging can be returned for up to 365 days in exchange for a gift card. Easy returns via our returns portal. Read more in our terms and conditions.
