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Thread: Modern Sporter - Build Discussions

  1. #31
    Business Member alberta tactical rifle's Avatar
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    Quote Originally Posted by RedGaiter View Post
    This will be my first build, so I know almost nothing. I'm taking lots of notes in this thread. I just know I want 18.6" in 223 and for the entire rifle to be relatively light (8ish lbs)


    Question: What is the difference between mid-length and rifle-length gas system? I have googled a bit, and got mixed results. Which would be preferable for an 18.6" barrel?
    Rifle length will give you the best reliability.
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  2. #32
    Super GunNutz Mik123's Avatar
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    Quote Originally Posted by Kratos View Post
    The shortest ATRS Modern Sporter, quietest too I would bet :D

    I’ll also have a 300blk, 9mm, 762x39, and 223/556 Upper. Maybe 2 lowers. As funds become available of course.

    I won’t take up anymore room in this awesome thread.
    For the 7.62x39 would you only need a specific 7.62x39 bolt and barrel? Is there anything else that needs to be done to the feed ramps etc?

  3. #33
    CGN frequent flyer ThatM305Guy's Avatar
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    Quote Originally Posted by tstormt View Post
    I’m doing a 6.5 Grendel and a.223 upper. Here is what’s going in the Grendel

    Ballistic arms 20 inch barrel
    Odin works BCG
    Midwest industries mlok 15” handguard
    CNA milspec buffer/spring kit
    BCM gun fighter charging handle
    BCM pnt trigger assembly
    TNA gas tube
    TNA lower parts kit
    2a armament titanium gas block
    SBI hex brake
    Magpul Moe Grip
    Magpul moe slk stock
    So what's the deal with 6.5 Grendel bolts? In my internet wanderings It has been shown to be an incredible round. (In my opinion the ideal intermediate cartridge. Or at least thus far.) But the bolts look incredibly fragile. Has anyone made a proprietary bolt/barrel extension yet? I know NEA did something along those lines with their 7.62x39 guns.
    I am a kit hor(der)

  4. #34
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    Gonna strip a lot of parts off one of my ARs for my 223 build and then gonna get a second upper for a 6.5 build.

    Subbed for ideas.

  5. #35
    CGN Ultra frequent flyer jiffx2781's Avatar
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    Last edited by jiffx2781; 05-18-2020 at 10:56 AM.

  6. #36
    CGN Ultra frequent flyer griffin86's Avatar
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    Quote Originally Posted by ThatM305Guy View Post
    So what's the deal with 6.5 Grendel bolts? In my internet wanderings It has been shown to be an incredible round. (In my opinion the ideal intermediate cartridge. Or at least thus far.) But the bolts look incredibly fragile. Has anyone made a proprietary bolt/barrel extension yet? I know NEA did something along those lines with their 7.62x39 guns.
    A lot of guys go with the JP bolt.
    CGN Weekly Schedule
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  7. #37
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    For the 6.5 bolt can you use any 223 carrier?

  8. #38
    CGN Regular anoxia's Avatar
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    I'm building a precision rifle and likely a hunting rifle in .224 Valkyrie once ATRS finishes their evaluation.

    Precision
    PR 20" carbon fiber barrel.
    JP LMOS BCG
    JP SCS gen 2
    Magpul UBR gen 2
    Precision Arms M4-72
    JP MKIII handguard or PRI carbon handhguard
    Superlative Arms adjustable gas block
    Ergo deluxe grip
    Torn between the Timney Calvin and Adaptable Triggertech

  9. #39
    CGN Ultra frequent flyer jiffx2781's Avatar
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    Last edited by jiffx2781; 05-18-2020 at 10:56 AM.

  10. #40
    CGN Ultra frequent flyer griffin86's Avatar
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    Quote Originally Posted by jiffx2781 View Post
    JP Enterprises 6.5 grendel bolt. Don't buy anything else unless you like things blowing up beside your face.
    That’s ridiculous. I haven’t seen any problems with Toolcraft BCGs, their BCGs cost $50 USD less than a JP bolt.
    CGN Weekly Schedule
    Monday: Can't access the EE! Tuesday: Non-restricted rifles like AR-15? Wednesday: Difference between 223 and 556? Thursday: 9 or 45? Friday: Bear Defense thread Saturday: Why is this prohibited? Sunday: Zombie thread

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