• Machine down factory HK 91 Barrel to 51 Specs.
  • Reinforce cocking tube.
  • Modify bolt.
  • Install newer combat style roller bearing paddle flap mag release.
  • Refinish.


What’s the typical lead time for this work?:

  • 2-3 weeks depending on workload

Can I ship the gun directly to TPM?: 

Yes it’s considered gunsmithing that does not require FFL to FFL. Check your local laws to be sure.


BEFORE shipping to us please fill out a work order (Download Here):

Remove the following parts:

  • Trigger group
  • Bolt group
  • Factory case
  • You MUST ship the upper signature required to be sure we receive the gun.

HK 91 to HK 51 Conversion


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