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  1. #1
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    Need 7.5" Rail Suggestions for a 300BLK Build

    Gents,

    I need suggestions for a 7.5" rail! Working on another 300blk upper and rough math is telling me that a 7.5 is the longest I will be able to go (will be able to get exact dimensions if the mailman drops off some parts today). The rail I'm currently looking at is an SLR ION but I would like to see if there is something out there that I'm missing

    Build info:
    The build is being specced' around a Griffin RSTA. I wanted to build the most compact overall package that will give me good accuracy, heat mitigation, low gas blowback, able to fire with/ without the suppressor, yada yada yada. If the maths work out, I should end up with the equivalent of a 15" - 16" barrel when the suppressor is attached.

    Barrel: 10.3" BA Premium, Hansen Profile
    BCG: LANTAC EBCG
    Charging Handle: Griffin SNACH
    Muzzle Device: Griffin OTB Suppressor Mount, flash hider variant
    Suppressor: Griffin RSTA


    My biggest concern at this point is how the Hansen Profile will react with a reflex suppressor. Since there will be some space between the Muzzle device/ suppressor assembly, will there be weird harmonics? Will that air space retain heat or help dissipate heat? Just airing come concerns on the build. The Hansen profile may be thick enough to not even make any measurable difference.

    Pics for reference:



    Looks like I have 7.6" between the receiver and the edge of the mount. Also have about 1mm space between the barrel and mount.

  2. #2
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    Midwest Industries Gen 3 MLOK (also available in KeyMod).
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    BCM KMR-ALPHA 7" KeyMod only.
    Name:  BCM-KMR-A7-556-BLK-2T.jpg
Views: 1039
Size:  11.0 KB

    All pics from manufacturers' sites.
    Last edited by RiverRat; 20 January 2016 at 19:00.

  3. #3
    Join Date
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    Another option and one of my personal favs. Is the 7" Fortis Rev 2 it Measures 7.3".

    Pic from fortis site


  4. #4
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    I just got an NSR7 for my 8.5 300BLK. A little old school, but until SMOS brings out there new rails...
    Last edited by Brahmzy; 22 January 2016 at 08:33.

  5. #5
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    If you go with a Seekins MCSR or Aero Precision Enhanced handguard you can go longer and partially shroud the can.

    Something like this: http://aeroprecisionusa.com/m4e1-sd-...-receiver.html

  6. #6
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    Another vote for the NSR 7 at 7 1/4".


  7. #7
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    I'm on the hunt for a Mega wedge lock carbine length for my 8.3 build

  8. #8
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    Geissele MK4 or MK8 ... I've got a MK8 7" waiting for a 4.5" 9mm build.

  9. #9
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    SLR Rifleworks makes some pretty good handguards, and a number of them either 7, 7¼ or 7½" in length
    -----------------------------------------------
    Jim
    "You can never have too many guns" - my wife's actual comment
    Alaska Fun

  10. #10
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    Yeah. An SLR 7.5 seems like it will be the best fit. Was hoping something new would have come out of SHOT

  11. #11
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    I have a Bravo Company KMR7 on a 8.5 barrel .
    Name:  6f0b1b2a-055c-4f18-a74b-38614f50ee0d.jpg
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    Name:  464bc740-7e9f-469b-8de1-de2c8b946b39.jpg
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  12. #12
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    I'm running a KMR 7" on an 8.5" also. I really like the dimensions of the KMR.

    NRA Benefactor Member
    NRA Certified Instructor

    "I won't be wronged, I won't be insulted, and I won't be laid a hand on."
    John Wayne - "The Shootist"

  13. #13
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    Quote Originally Posted by Jerry R View Post
    I'm running a KMR 7" on an 8.5" also. I really like the dimensions of the KMR.

    I hate posting photos with all of your guys quality photos . I'm gonna go buy a Polaroid and scan the polaroids in and give it that artsy retro look .

  14. #14
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    Finally got the upper and the basic rifle together. Going to start experimenting with a loadout, and I need to settle on a MRO mount. Final pics when the entire thing comes together.

    There is a lot more space between the end of the reflex mount and the handguard than I though there would be. Probably around 1/4"





    Highlights:
    LANTAC BCG
    Griffon SNACH
    JP Silent Capture Spring
    Geissele Trigger

  15. #15
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    schambers, how is this working out for you?

    I'm looking at several piece meal 9mm upper builds and can't decide on a rail combo.

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