Action Army Steel Power-Up Spring for Airsoft AEGs (Tension Options) SSR90 Thunder B grenades use a

Thunder B grenades use a safety pin / spoon design very similar to a real grenade

Supports sustain trace function up to 35 PRS (2100 RPM) Running fire

Weighted plates perfectly suited for exercise where a weighted vest is used

Available in black

Holds tight to magazine to keep secure

Action Army Steel Power-Up Spring for Airsoft AEGs (Tension Options) SSR90 Thunder B grenades use aSteel construction Non linear spring design Easy to install part to increase your stock FPS Compatible with Tokyo Marui, Matrix and other compatible Airsoft Gearboxes 110% (M85) ~270~310 F. P. S. 120% (M90) ~280~340 F. P. S. 130% (M95) ~290~370 F. P. S. 140% (M100) ~320~380 F. P. S. 150% (M110) ~330~390 F. P. S. 160% (M113) ~340~400F. P. S. 170% (M115) ~350~420 F. P. S. 190% (M120) ~360~450 F. P. S. 210% (M125) ~400~470 F. P. S. 235% (M130) ~420~500