MPN: MTR-1395


  • 1/4" slotted screwdriver
  • Dual-lug M4 castle nut spanner wrench
  • 1/2“ hex wrench for scope mounts
  • Bolt override malfunction clearance tool
  • Fits B5 systems buttpads



  • Material: 420 Stainless Steel
  • Finish: Melonite
  • Weight: 0.49 oz.


  • Can be stored in B5 Systems stock buttpad


Whether you are a seasoned AR builder or building your first rifle, a good multitool can be a valuable addition to your tool kit. Here we have the B5 Systems x MultiTasker M:4 Tool, designed to perform various jobs.

Multi-Purpose Functionality

This tool can be used as a dual-lug M4 castle nut spanner wrench, which is necessary for installing and adjusting your rifle's buffer tube.

Additionally, this multitool can be used as a ¼” slotted screwdriver and a ½” hex wrench, which is ideal for installing scope mounts and optics. Lastly, the B5 Systems x MultiTasker M:4 Tool can also clear bolt override malfunctions, which can happen when a spent casing or a live round gets wedged or trapped between the bolt carrier group and the charging handle.

Compatible with B5 Systems Butt Pads

The B5 Systems x MultiTasker M:4 Tool is made from 420 Stainless Steel and has a melonite finish. This multitool is also quite convenient to store on your rifle, and it fits the inside of all B5 Systems butt pads.

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