RotoMetals2WidenersRepackboxStainLess Steel Media
MidSouth Shooters SupplyGraf & SonsInline Fabrication

Results 1 to 11 of 11

Thread: PSA 300BO not working right.

  1. #1
    Boolit Master
    Join Date
    Oct 2013
    Posts
    2,299

    PSA 300BO not working right.

    Local shop knows me as the guy to call when they get a weird old gun or a problem gun. Somebody had brought in a Palmetto state 300BO rifle. Fed fine, it was cycling. Often would not cycle, then ripped a case in half and left the rest inside the chamber to be dug out. Not going to shoot it suppressed or use subsonic ammo.

    Seemed odd to me it would be sold w a 16in barrel and non adjustable pistol gas system. My bet is on to much gas supersonic. It was a trade in gun, and more than likely the previous owner had issues and just got rid of it vs fixing it.

    Question was the fix. Not going to bother w subsonic, so a carbine gas system? Or just an adjustable block?

  2. #2
    Boolit Buddy
    Join Date
    Oct 2017
    Location
    New Jersey
    Posts
    262
    I have PSA 300AAC upper with 16" barrel and pistol gas system. No problems at all unless you form your 300 brass out off .223 brass thats too thick. Thats the only time I had rounds stuck in the chamber but once fired I had no extraction issues there neither.

    Look at the extraction pattern and that should tell you if its over gassed. 1-2pm extraction is good but 4-5pm is too much gas. I had that issue with my PSA 5.56 upper but not the 300 one.

  3. #3
    Boolit Grand Master Texas by God's Avatar
    Join Date
    Mar 2016
    Location
    Texas
    Posts
    6,043
    I can't say whether or not pistol gas system is your problem but I have put together 4 300s on carbine gas system with 16 inch barrel and they run flawlessly. I only use supersonic ammo as well.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  4. #4
    Boolit Master
    Join Date
    Mar 2016
    Location
    Texas
    Posts
    770
    Well you could try an adjustable gas block and see if it works Ok with it or not.

  5. #5
    Moderator



    Join Date
    Jun 2013
    Posts
    5,177
    Was the case that separated steel? Reload? Does the headspace pass the go/no gongauges? Is it a factory upper or parts upper put together by someone?

  6. #6
    Vendor Sponsor

    Smoke4320's Avatar
    Join Date
    Apr 2013
    Location
    Right here ..at least I was a minute ago
    Posts
    3,931
    Check the chamber for roughness.
    This has been an issue on several psa rifles.
    I carry a Nuke50 because cleaning up the mess is Silly !!

    http://www.bing.com/search?q=nuke50&...7ADE&FORM=QBLH

    Selling Hi Quality Powdercoating Powder

    PULSAR night vision and thermal dealer !!!
    PM me for a good deal

    I am not crazy my mom had me tested

    Theres a fine line between genius and crazy .. I'm that line
    and depending on the day I might just step over that line !!!

  7. #7
    Boolit Master
    Join Date
    Oct 2013
    Posts
    2,299
    It was a remington brass case, factory ammo, they are not a reloader. No idea on gauges, shop has none. Not something I carry around all the time. I stopped in for a soda and shoot the breeze 'hey glad your here'. I asked what another gun to make ammo for? Last gun I bought there was a Swiss Vetterli.

    Used gun, no idea on who did what. Guess it will be shipped back to PSA to see whats wrong. I was not impressed w the bold head at all. Almost like the locking lugs were peened. Who knows what the previous owner might have done to it. Plenty of bubbas out there.

    Just seemed odd w a 16in barrel and non adjustable pistol gas system.

  8. #8
    Boolit Master


    Join Date
    Jul 2010
    Location
    Ft. Lauderdale, FL
    Posts
    1,205
    Pistol gas systems on 300blk aren't uncommon at all. Adjustable would make more sense, but that's not common for factory guns that I see.

    The idea is supposed to be that it can run subsonic or supersonic just as well. I've seen some factory rounds that seem horribly overgassed in a pistol length carbine though.
    ΜΟΛΩΝ ΛΑΒΕ

  9. #9
    Boolit Grand Master



    jmort's Avatar
    Join Date
    Jan 2011
    Location
    Color Me Gone
    Posts
    7,732
    I believe AR pistols run pistol buffers is the ATF and the arm braces made to fit them. You can run 300 BO sub-sonic from around 8.5" on up
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

  10. #10
    Boolit Master Boolit_Head's Avatar
    Join Date
    Dec 2014
    Posts
    911
    Pistol gas is more versatile and I don't have much problem on my 7.5 inch barrel. I do run a adjustable gas system just to cut back the gas when suppressed. The carbine gas length are finicky beasts but if you would be happy finding one load that it shoots well and that's it they would be ok. New barrels can be had for reasonable prices if you want to change something anyway.
    On every question of construction let us carry ourselves back to the time when the Constitution was adopted, recollect the spirit manifested in the debates, and instead of trying what meaning may be squeezed out of the text or invented against it, conform to the probable one in which it was passed.

    Thomas Jefferson, letter to William Johnson, June 12, 1823

  11. #11
    Boolit Grand Master



    jmort's Avatar
    Join Date
    Jan 2011
    Location
    Color Me Gone
    Posts
    7,732
    At less than 8.5" sub-sonic heavy bullets are problematic.

    "...here was my day yesterday with this barrel and the v7 6.5". cut and paste from another thread

    velocity data: 70 deg F
    barnes rangeAR 90gr
    v7 2154, 2164, 2195, 2111, 2207
    r2b 2116, 2070, 2110, 2116

    barnes ttsx 110gr
    v7 1975, 1961, 1972, 1978, 2001
    r2b 1917, 1916, 1937, 1920, 1925

    Federal copper 120gr
    v7 1779, 1799, 1798, 1792, 1802
    r2b 1735, 1739, 1723, 1732, 1748

    fiocchi 220gr
    v7 797, 798, 828, 806, 824 cycled unsuppressed, no lock back
    r2b 838, 828, 849, 822, 838, did not cycle unsuppressed"

    AR15.COM
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check