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  1. Mackjack

    Does this "sound" right to you?

    Trans sonic? I think that’s the word. Right on the cusp of sound barrier
  2. Mackjack

    Tungsten bolts for Mac platform ROF

    to both the replies above… trying to avoid damaging receiver from attempting to buffer out a heavier mass bolt trying to shorten the stroke And trying not to get runaways from too stiff of spring. Will trying either one be a big deal? Not sure lol. I could be over thinking it. Maybe less...
  3. Mackjack

    Tungsten bolts for Mac platform ROF

    Want to try and run the gun in 800-900 range. Why? Idk. For fun. Sometimes 600 rpm is boring slow. Can’t make a stock bolt that much slower.
  4. Mackjack

    Tungsten bolts for Mac platform ROF

    On page 2 of this thread it looks like Strobo did an excellent write up on what I think is equivalent to the A bolt in an M11 if that helps anyone else https://www.uzitalk.com/forums/index.php?threads/new-prototype-cf-w-%E2%80%9Ca%E2%80%9D-bolt-testing-in-380acp.89124/page-2
  5. Mackjack

    Tungsten bolts for Mac platform ROF

    Hello, I’ve done a fair bit of digging in the old threads, I almost found the correct thing, but it was one chart Tom had made regarding the cfw a bolt in an m11 and rates of fire related to spring coil counts and different ammo used…. So close but wrong gun. Question is, does anyone know of...
  6. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    Tina kept me up to date via email through out the whole process, sent tracking and stuff when it shipped etc
  7. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    Just got mine! On the list March 21 2023 Recieved March 23 2026 3 years, man time flies!😃 no one ever said the nfa world was for the impatient lol. Not complaining about the wait at all, I have great respect for practical solutions for taking on the financial risks of this niche project and...
  8. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    What ish rof do you get?
  9. Mackjack

    Still the best deal on an upper going

    Says estimated lead time 4 weeks. Was it saying that before
  10. Mackjack

    SBR’d my 10/22

    Oooo I like that. Was thinking of doing similar, but aiming for that 4-4.5” barrel length to keep bulk pack ammo subsonic.
  11. Mackjack

    New Uzi Owner - Let's SBR This Thing!

    If you can, engrave barrel so when you get bored it’s easier to sell as a normal gun. I had a semi auto uzi… didn’t hold my attention long. Kinda like how people think having a baby will fix a broken marriage… and it doesn’t. Sbring a semi auto uzi is quite similar…. Just my $0.02 cents worth
  12. Mackjack

    FRT APC9 / SPC9 Suomi Drum Lower

    Dang. This will just make Suomi drums even harder to come by 😂
  13. Mackjack

    Some Firearms Came Into My Life

    Don’t change any parts on them if you aren’t going to keep or shoot them. They are better left original. As for keeping or selling… I once had trouble parting with my grandfathers boat, when someone told me…. Isn’t every other old boat for sale someone else’s grandpas, or fathers? You can’t...
  14. Mackjack

    Lage MFG Belt Fed and 10/22 Uppers - New Release

    I can’t wait to see how the belt fed is made and functions/ how it built. That looks very cool
  15. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    Thank you. That’s the speed I’d like to it, and for the same reasons. I have a full size tungsten bolt and it’s cool and all… but just too slow and choppy sometimes. Want to hit the middle ground between 600 and 1200 roughly
  16. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    This was done in an m11/9 or m11/9a1? Thanks
  17. Mackjack

    Gauging Interest in Tungsten Slow Fire Bolts

    Think you can get it to 900 rpm or so with the right spring and buffers in an m11/9?
  18. Mackjack

    Versa-12 videos & pictures

  19. Mackjack

    SW76 Sub Guns Soon to be sold out by JMB Distribution

    What is the navygunner website?

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