If you are interested to elevate your SRS muzzle velocity and trajectory stability but still struggling to find a suitable upgrade HOP kits...
You must to try the T-N.T. APS-X HOP-UP System!!
Just simple install steps , then you can see the significant results!!
In the case does not raise the kinetic energy , but effective range can improve about 40 % to 60%!!
 

Include :

●T-N.T. TR-HOP bucking for SRS *1

●T-N.T. S+Precision double I/D Air-cushion inner barrel 470mm *1