M40A5 (T.Marui) 1.99j Spring

This upgrading spring supplies 1.99j shooting power in M40A5(T.Marui) with original T.Marui parts.  The power is about 414fps with 0.25g BB.  The supreme quality Japan steel piano wire has oustanding durability and reliability. All products are made for airsoft only.  They are not made for real steel firearms.