The 6.8 SPC ll

Discussion in 'Firearms' started by HK_User, Jun 30, 2019.

  1. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    Not new but a hard hitting round in the AR15 platform.

    The ll series is harder hitting and has less chamber pressure due to redesigned chamber and a 11 to 1 twist.

    If you must have a 30 round mag then BARRETS is your best choice.
    Less capacity Mags as a 5 round are easy on the wallet and for the best IMHO 10 round up are the PRI. PRI's magazine has a full welded seam with high quality equipment in a butt weld and it has a bottom form that allows for easy cleaning and higher strength, no spot welds.

    PSA sells the upper of preference. PSA 18" Mid-Length 6.8 SPC II 1/11 Stainless Steel 15" Lightweight M-Lok Upper with BCG & CH

    Last edited: Jun 30, 2019
  2. apache235

    apache235 Monkey+++

    1:11 twist is a bit slow especially if you are interested in the heavier bullets. I do like the PSA stuff though and if you have a .224 Valkyrie, this upper would make a lot of sense. Just don't get things mixed up with the new LWRC six-8 which takes MagPul magazines. I wonder if you could put a .224 Val on a Six-8 lower????
    HK_User and Gator 45/70 like this.
  3. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    The LWRC six-8 requires a different lower if MagPul mags are used.
    None the less you should change out all ejector covers to reflect the round the upper is chambered for.
    As well the BCG should be marked.
    MagPul made the LWRC six-8 mags a bit larger as a way to have a stronger and thicker plastic.
    The twist was changed to meet the original Mil requirements and if that had been completed before the trials then the 6.8 SPC would have likely been adopted.

    "I wonder if you could put a .224 Val on a Six-8 lower????"

    No, upper and lower must match the MagPul mag.


    Magpul’s Magazine for the LWRC Six8 UICW Carbine
    At last week’s USASOC Sniper Competition I got a chance to shoot a few photos of the Magpul M3 magazine developed specifically for the new LWRC International Ultra Compact Individual Weapon. The idea was to give you a better look at how to identify this magazine even though it remains quite rare.


    Overall, it has the same layout and components of the new commercial M3 PMAG. Yet, the actual dimensions are quite specific to accommodate the UICW’s magwell.


    One striking feature is the Red color of the follower and floor plate lock.



    You can also identify the magazine by the data plate.


    Finally, the curve is slightly different since the 6.8 round is different than the 5.56 round.


    As the UCIW’s magwell features slightly different dimensions than a standard lower, you aren’t going to be able to use this mag with your current 6.8 carbine.

    For more info visit
    Last edited: Jul 3, 2019
  4. Ura-Ki

    Ura-Ki Grampa Monkey

    Never been a fan of the 6.8 and weather or not it ever really catches on will tell the tail!
    6.5 Grendell or a .300 B.O. for a nifty hard hitting carbine for me, any thing else is fully covered by the bigger 7.62X51 and even an AR type carbine in 7.62X39 would make more sense! IF your trying to extend the hitting power at the big end of the AR's reach, your really looking for a 7.62X51 and just haven't come to terms with that! LOL
  5. oil pan 4

    oil pan 4 Monkey+++

    So it's a really expensive AR with limited to no parts interchangeably?
    Or at least none of the big parts are interchangeable.
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  6. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    If you are talking about the UCIW Six-8, then yes.
    Just another case of trying to make one specialized weapons system for a Government.

    The 6.8 is a good idea for some. Hard hitting out to 400 yards and the only problem is some want to use plastic mags. Plastic, in the AR15 platform, will not stand the strain of larger brass and bulge and deform the mag to a point of jams etc.
    Last edited: Jul 1, 2019
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  7. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    Correct for the 6.8 Larger Plastic Mags.
    Most likely a Contract Requirement.
  8. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    No matter what they make some will want to hot rod it.

    Now we hear complaints of "BUT it won't run a larger longer bullet. Those are the folks that need to step up to the 7.62x51.

    The 6.8 SPC ll used in the PSA light weight AR15 Platform with a 18 inch barrel and a 15 round PRI Mag (loaded) and flip up sights weighs in at 7.8 lbs.

    Rounds are either 110 Match or 110 FMJ.

    At 50 yards in the brush it is deadly.

    Longer range when the Lt Weight Scope is used.

    Do not waste your money on the C Products Mags. The higher cap allow the bullets to rattle in the mag and FTF> not to mention a real downer in a vatmint rifle.
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  9. Gator 45/70

    Gator 45/70 Monkey+++

    Is there a 6.5 grendel round or am I not reading the small print here?
    HK_User likes this.
  10. Gator 45/70

    Gator 45/70 Monkey+++

    Crap forgot the picture


    HK_User likes this.
  11. HK_User

    HK_User A Productive Monkey is a Happy Monkey

    There is a
    6.5mm Grendel
    From Wikipedia, the free encyclopedia
    Jump to navigation Jump to search
    6.5mm Grendel
    6.5mm Grendel showing variety of bullets—144 gr (9.3 g) to 90 gr (5.8 g)
    Type Rifle
    Place of origin United States
    Production history
    Bill Alexander and Janne Pohjoispää
    Designed 2003[1]
    Parent case
    .220 Russian[2]
    Case type Rimless, bottleneck
    Bullet diameter 6.71 mm (0.264 in)
    Neck diameter 7.44 mm (0.293 in)
    Shoulder diameter 10.87 mm (0.428 in)
    Base diameter 11.15 mm (0.439 in)
    Rim diameter 11.2 mm (0.44 in)
    Rim thickness 1.5 mm (0.059 in)
    Case length 38.7 mm (1.52 in)
    Overall length 57.5 mm (2.26 in)
    Case capacity 2.3 cm3 (35 gr H2O)
    Rifling twist 1 in 8" or 1 in 9"
    Primer type Small rifle
    Maximum pressure ) 52,000 psi (AR-15 bolt), 58,000 psi (case strength)
    Ballistic performance

    Bullet mass/type Velocity Energy
    90 gr (6 g) Speer TNT 2,880 ft/s (880 m/s) 1,658 ft⋅lbf (2,248 J)
    108[3] Scenar (moly) 2,790 ft/s (850 m/s) 1,866 ft⋅lbf (2,530 J)
    120 gr (8 g) Norma FMJBT 2,700 ft/s (820 m/s) 1,942 ft⋅lbf (2,633 J)
    123 gr (8 g) Sierra Matchking 2,650 ft/s (810 m/s) 1,917 ft⋅lbf (2,599 J)
    130 gr (8 g) Norma 2,510 ft/s (770 m/s) 1,818 ft⋅lbf (2,465 J)
    Test barrel length: 24 inches
    Source(s): Alexander Arms Pressure-safe Load Data
    The 6.5mm Grendel (6.5×39mm) is an intermediate cartridge designed by Arne Brennan, Bill Alexander, and Janne Pohjoispää as a low recoil, high accuracy, 200–800 yard cartridge specifically for the AR-15. It is an improved variation of the 6.5mm PPC.[4] Since its introduction, it has proven to be a versatile design and is now expanding out into other firearms including bolt-action rifles and the Kalashnikov system.[5]

    The name "6.5mm Grendel" was a trademark owned by Alexander Arms until it was legally released to allow the cartridge to become SAAMI standardized.[6][7]
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