Rapax HULK High Velocity Spring (4+J)

Thousands of happy users use our springs in their Silverback SRS/Tac41, Novritsch SSG10, SSG96, …

Springs are 13mm outer diameter, so they fit all above mentioned sniper replicas.

Joule may vary depending on the setup used on SRS/TAC41, SSG10,24,96… piston weight, barrel length…

Results : Rapax HULK High Velocity spring gives between 3.5J (with 300mm barrels) to 4.9J for longest  barrels.

We remind you that J is measuring just with heavy bb´s and not with 0.2. Also your hop up need to be adjusted for best bb flight and not set to zero.

If the Rapax spring shoots too hot for your field, you can cut some coils without damaging the spring integrity as long as it is done properly.

The first thing you will notice is a lighter pull compared to standard springs, in short: less effort for more joule. The Silverback M170 and Rapax Hulk spring need similar pull strength but the Rapax Hulk spring gives more FPS/joule in comparison.

All springs are the same length, use the same material, have the same number of coils, ect.

Rapax handmade springs – made in Europe to give you the best and most silent results for your sniper such as SRS/VSR/SSG24.

Spring wire used for Rapax springs production is of the highest quality spring wire, ensuring a prolonged period of usage compared to other springs.

Tempering of these springs is made in a way to guarantee a long lifetime and very small FPS/Joule loss over time.

Springs are made in tight tolerances regarding diameter, they prevent the “twang” sound in airsoft sniper replicas