ar in 762x39 question

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    Straightbolt

    Straightbolt

    unindicted co-conspirator
    Apr 4, 2015
    2,504
    The 'Burbs
    clandestine said:
    5) If the Bolts and Firing Pins are magnetic they will pickup projectile debris from feeding and extracting on guns with marginal mahs, and ones that have rough feed geometry. This will lead to light strikes because the magnetic debris cause issues when the gun gets hot.

    Other issues are companies that is .308 spec bores for the barrel instead of barrels with the proper bore. This bumps up chanber pressure and leads to chambering and extraction issues.
    Click to expand...

    What causes the bolts and firing pins to become magnetized or is the manufacturer magnetizing them at the factory ?
     
    clandestine

    clandestine

    AR-15 Savant
    Oct 13, 2008
    37,031
    Elkton, MD
    Straightbolt said:
    What causes the bolts and firing pins to become magnetized or is the manufacturer magnetizing them at the factory ?
    Click to expand...

    MPI or just the machining process itself can cause magnetism.

    The answer is they are not degaussing parts. Lots of companies skip things because most consumers just don't know better.
     
    O

    omegared24

    Ultimate Member
    Dec 23, 2011
    4,747
    Ijamsville, MD
    danb said:
    I dont think so. FB is all ponies and unicorns and everything runs flawlessly all the time there.

    real world (and Youtube), not so much. Mags are a notorious problem for AR 7.26x39. Getting the right ones are key. ASC mags supposedly work well, but then others not. May depend on the specs of the upper, or how it mates to the lower (there can still be slop in "milspec"). I have seen malfunctions on youtube, but not FB. I can see the light primer strike issue being a problem as well. Main #1` reason I have not bought /built a 7.62x39 AR is mags. We are mag restricted in MD and I would probably have to make a **** ton of trips out of state to find ones that work.

    They came up with a 100% reliable solution to AR 7.62x39, its called 300 BLK. Same ballistics, in a cartridge that works for the AR.
    Click to expand...

    I agree...FB never ceases to amaze me.
     
    danb

    danb

    dont be a dumbass
    Feb 24, 2013
    22,704
    google is your friend, I am not.
    DutchV said:
    ASC also makes ten round mags for these, in case you don't want to wait for your next road trip.
    Click to expand...

    Except ive seen videos 10 rounders are less reliable than 30. I can only speculate the wierd bend in 7 62x39 AR mags needs more oomph from the follower to force cartridges past it. Honestly dont know, but i'm yet to be convinced to gamble $$$ on a rifle that seems likely to have problems becaus of basic design issues. If I dive in, it will be a specialized lower that takes AK mags, or M+M10x or something... or 300 blk which really is the same ballistically and 100% reliable in AR. I am not interested in being a Guinea pig. There are enough "AK ish" rifles which seem like better options, legal in MD.
     
    dreadpirate

    dreadpirate

    Ultimate Member
    Mar 7, 2010
    5,521
    Cuba on the Chesapeake
    danb said:
    They came up with a 100% reliable solution to AR 7.62x39, its called 300 BLK. Same ballistics, in a cartridge that works for the AR.
    Click to expand...

    Not sure that 300 Blackout equals 7.62x39 (AK round has a bit more energy); but with all of the issues associated with shooting 7.62x39 out of an AR, 300 Blackout is still a way better option IMHO. And 300 Black seems to do well in short barrels if you want to go the way of an SBR.
     
    O

    omegared24

    Ultimate Member
    Dec 23, 2011
    4,747
    Ijamsville, MD
    dreadpirate said:
    Not sure that 300 Blackout equals 7.62x39 (AK round has a bit more energy); but with all of the issues associated with shooting 7.62x39 out of an AR, 300 Blackout is still a way better option IMHO. And 300 Black seems to do well in short barrels if you want to go the way of an SBR.
    Click to expand...

    Every test I've seen has them equal.

    Either way, I agree with you, 300blk is a better option with all the other benefits even if 7.62 has that extra bit of power.
     
    OLM-Medic

    OLM-Medic

    Banned
    BANNED!!!
    May 5, 2010
    6,588
    omegared24 said:
    Every test I've seen has them equal.

    Either way, I agree with you, 300blk is a better option with all the other benefits even if 7.62 has that extra bit of power.
    Click to expand...

    Yeah .300 shines in shorter barrels. It just doesn't need more than 9"

    If you're getting anything longer than a 9" SBR or pistol it's not worth it in my opinion
     
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