M4 (T.Marui) CNC Polymer Bolt B

This polymer Bolt B (part No.133), which is made by precision CNC process, and steel screw (part No.134) are extreme lightweight set that is specially made for M4 (T.Marui) GBB.  While the polymer Bolt B is 13g lighter than the orginial part, this polymer Bolt B has good strength with higher elasticity than the original part.  Therefore, this polymer Bolt B has only 55% weight of the original part, and it assists the bolt to increase the recoil speed and minimize friction around the buffer tube. All products are for airsoft only.  They are not made for real steel firearms.