Large bore ar15 uppers

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    01m6ta

    Member
    Jul 12, 2012
    28
    Here is my 450 bushmaster upper I just finished building. Shot 60 rounds through it last weekend with a modified pmag and it functioned 100%. Bolt and barrel are from Tromix and the rest is a concoction of whatever was on sale from Midway or Primary arms. The original upper for this lower is a 300 blackout i built 7 or so years ago. Lower is a Spikes with a CMC/Lantac trigger.

    Anyone build large bore ar uppers?

    20170605_172218.jpg


    20170601_170316.jpg


    20170605_184728.jpg


    All in all I was really happy it functioned perfectly and recoil was no where near what I thought it would be. I gotta video I'll share but taking its good old sweet time loading.
     
    0

    01m6ta

    Member
    Jul 12, 2012
    28
    Well I share alot photos and now photobucket is now cutting people off until we upgrade our accounts to their P500 plan. Which is $400 per year. Thats not happening. Let me mess around and try and remember my flickr password and I'll post them.

    Sorry guys
     
    B

    BradMacc82

    Ultimate Member
    Industry Partner
    Aug 17, 2011
    26,177
    .450? That's ok. Fun round, not that hateful to handle.

    IMAG1087_BURST002.jpg

    16.5" .50Beo, also quite fun - little bit rougher on the shooter(s), especially minus the pepper-pot brake. Can't stand Bill Alexander, but I do like the impracticality/overkill nature of this round. Add in some 530gr steel-tipped rounds, and it's just about right.

    IMAG0437.jpg

    And it's got some accuracy potential to boot - 3 rounds, 103 yards. (As long as your target is less than 230/250 yards away...)
     
    j_h_smith

    j_h_smith

    Ultimate Member
    Jul 28, 2007
    28,516
    There are folks who are making a quasi 50 Beowulf upper. It's a 12.7 x 42 upper. Not manufactured by Bill Alexander but is 100% compatible with the 50 Beowulf ammo. I have a 10.5" barreled upper in a pistol configuration. It will become a SBR if the ATF would be so kind as to send me my stamps.

    I had one of the original 16" Alexander rifles without a brake and that was a bear to shoot. Sold it when I bought the new 10.5" upper.

    No reason to hate on Bill anymore, just get even and buy the other manufacturer's upper. ;)
     
    B

    BradMacc82

    Ultimate Member
    Industry Partner
    Aug 17, 2011
    26,177
    I've helped a few people do the 12.7x42 builds, only downside I've seen with the available barrels is the gas block seat seems to be right around the .752/.753" range - so a little bit of sanding on the barrels block seat is needed to get the block to locate properly. Nothing too hateful, just a little more work.
     
    0

    01m6ta

    Member
    Jul 12, 2012
    28
    Nice .50. I was torn between the 3 rounds on which to build and it honestly came down to ammo availability. I used to handload when i got into my 300 blackout but don't have time for that anymore. 450 bushmaster is getting very popular since the new laws passed in Illinois, Michigan, and Ohio i think regarding hunting with a straight wall cartridge.
     
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