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Thinking of doing a Sterling Mk4 "SMG" SBR, need INFORMED technical advice please.

Discussion in 'NFA Weapon Discussion' started by Stomper, Nov 9, 2012.

  1. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    I have an intact Sterling Mk4 SMG receiver with a faux-bolt (that I made from pipe), spiked-welded barrel, and a de-aced (welded) FA trigger group. I can completely break it down and remove all the components, and I just found out there are complete parts kits available online that include a New US made repro barrel (SMG length, not the goofy looking 16" with fugly front barrel-nut/trunion found on current CAI specimens.

    My question is, does anyone KNOW if the SMG repro-barrel (originally for an open-bolt system) will work with the SA closed-bolt and SA trigger group that can be purchased these days? I'gm hoping so, because I'll have a Form-1 and $200 in the mail yesterday for my 2nd SBR if this works!

    Thanks for any accurate input! :thumbup:
     
  2. Swedish K

    Swedish K SW Washington Moderator Staff Member

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    A buddy builds guns for a movie gun company - full functional post samples and conversions to semi, etc. I'll give him a call this week and see if he's done any of the Sterling mk 4 guns. I would guess that there wouldn't be any change to the barrel though.
     
  3. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    That'd be great, I'd appreciate it! I'm thinking I can drop in a functioning SMG barrel, SA bolt and trigger pack and be in business, but don't want to drop a few hundred bucks into it only to wind up with the paper weight that it is now... of course I wouldn't be able to try it out first hand until I had a SBR tax stamp in hand.
     
  4. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    Here are some photos for you to look at of what I have.

    IMAG0508.jpg
    IMAG0509.jpg
    IMAG0510.jpg
     
  5. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    If anyone else gets the Sterling bug, you can get parts from IMA or Apex. Just google, " Sterling SMG parts " and you'll see several links and such. :thumbup:
     
  6. teflon97239

    teflon97239 Portland, OR Well-Known Member

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    That is beautiful!
     
  7. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    Thanks! Its a work in progress, but it'll happen. ;)
     
  8. Swedish K

    Swedish K SW Washington Moderator Staff Member

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    Stomper - I left a message and never heard back - just saw the thread again so I'll have to give him a call again and see if he has an answer.... again....
     
  9. Swedish K

    Swedish K SW Washington Moderator Staff Member

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    Talked to a friend finally - the short version is he is fairly certain that the barrels are the same between the semi and the SMG barrel - as you are going to SBR it the length is not an issue. He said the last ones he worked on for some movie were semi and he had to pin the firing pin in place and build up the lip on the bottom of the bolt a bit for full auto (dealer post sample) firing from an open bolt.
     
  10. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    Hey Swede,

    Thanks for your efforts on that, MUCH appreciated!

    I'm going to purchase a semi-auto bolt for it first, as I believe I need to weld in a denial island inside the receiver to prevent a full-auto bolt from being installed. I'm going to do the paperwork this weekend and get it sent off next week.... Woo Hoo!