Spare spring for low capacity magazines

This is spare spring, which replace original one in your low-cap.magazine. Is made of stronger steel spring wire (diameter plus 0.1mm) with proper temper. Thanks of this it is able to push out heavy bullets with higher speed. If you have gun with high rate of fire, standard magazines could cause problem with slow bullet feeding. Notice: With this stronger spring, you loose some capacity of the magazine (due to wire diameter). For example 70 round magazine can hold around 60 BBs.