Element - Extra fit 120% Spring AEGs - IN0123
Element - Extra fit 210% Spring (480-500fps) - IN0122
Element - Extra fit 140% Spring AEGs - IN0125
Element - Extra fit 190% Spring (450-480fps) - IN0121
Element - Extra fit 150% Spring AEGs - IN0126
Element - Extra fit 170% Spring (430-450fps) - IN0120
Element - Upgrade Oil Temper Spring M125 (390-430fps) for VSR10 - IN0107
Element - Upgrade Oil Temper IRREGULAR-PITCH M175 ST Spring (550-620fps) - IN0111
Echo1 - ASR Sniper OEM Spring (~440fps)
Star M249 Spring Guide for Echo1/A&K/ARES M249
Lonex - SP M110 (350-380FPS) Spring - GB-04-02
Lonex - Ball Bearing Spring Guide for Next Generation M4 EBB - GD-01-03
Element - CNC Spring guide V2 gearbox (4pcs/set) - IN0731
Element - CNC Spring guide V3 gearbox (4pcs/set) - IN0732
Element - Oil Temper Wire Irregular M145 ST Spring for AEG (450-500fps) - IN0103
Element - Oil Temper Wire Irregular M105 ST Spring for AEG (330-360fps) - IN0106
Element - Oil Temper Wire Irregular M155 ST Spring for AEG (480-560fps) - IN0104
Element Ball Bearing Spring Guide for Ver. 2 Gearbox - IN0501
MAXX - CNC Aluminum Stainless Steel Spring Guide - MX-SPG001S1