KJ M4 Version 3 Bolt Kit

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  • Regular price $49.99



Converts your older KJ M4's into Version 3

Eliminate the need for the rubber return belt (Vr 1) or Cylinder retention tab (Vr 2)

Includes:

- Completely assembled version 3 bolt (cylinder / spring / valve etc)

- Newest version buffer

- Newest version bolt stop