Jump to content


Japanese Type 99 Machinegun Caliber Conversions?

  • Please log in to reply
4 replies to this topic

#1 azboater


    Long Time RKI Member

  • Board Benefactor
  • 639 posts
  • Gender:Male
  • Location:Arizona
  • Interests:God & Country, Family, Firearms, Automobiles, History & Historical Photography

Posted 01 April 2019 - 12:02 AM

I am interested in purchasing a type 99 machine gun
However would like to know if any board members knows a gunsmith who does a .308 caliber ( or other caliber) conversion on these?
I dont anticipate shooting it in 7.7 because of scarcity of ammo

Thanks In Advance

Edited by azboater, 01 April 2019 - 01:00 AM.

  • 0

#2 Black River Militaria CII

Black River Militaria CII

    Industry Expert

  • Regular Group
  • 781 posts
  • Gender:Male

Posted 01 April 2019 - 07:21 PM

Aside from what I mentioned in a post to you offsite, the T92 HMG ammo on strippers is semi-rimmed. For firing in T99s MGs in 7.7, I turn down the rim slightly so it beomes rimless. This ammo is the same as standard rifle ball ammo and functions perfectly in the T99s.
Caveat: the cintage Jap 7.7 ammo is very corrosive but careful cleaning by immersion in boiling water with the addition of some ammonia cleans it up perfectly. Swab the bore and gas tube with the same water. Never have had an6 lroblems with the ammo if thwt is done. FWIW

Edited by Black River Militaria CII, 01 April 2019 - 07:22 PM.

  • 0

#3 StrangeRanger


    Regular Member

  • Regular Group
  • 189 posts
  • Gender:Male
  • Location:Ohio

Posted 01 April 2019 - 10:31 PM

A friend of mine makes rimless 7.7 Jap ammo from .30-06 cases, he says it's easy, just resize in a 7.7 die and trim.  The case head is approx. .002 undersized but the first firing takes care of that.  May be too much work for machine gun consumption rates though

  • 0

#4 DZelenka


    RKI Member

  • Regular Group
  • 657 posts
  • Gender:Male

Posted 01 April 2019 - 11:46 PM

You can reload it with all new components for under a buck a round. How much ammo do you really need?
  • 0

#5 fifthmdec


    Regular Member

  • Regular Group
  • 230 posts
  • Gender:Male
  • Location:NV

Posted 12 April 2019 - 06:06 PM

Jim Langley in Congress Az, did them at one time. Do not know if he is still around and if so, has any left. In .308...
  • 0