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Thread: Range report : Colt CM 308 gas gun

  1. #21
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    Longer pins here.

    https://geissele.com/large-pin-colt-...mmer-pins.html

    Quote Originally Posted by markm View Post
    The trigger group is standard except for the longer pins that fit the forging. I still installed a Geissele for Pappabear using the shorter pins though.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  2. #22
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    thanks Clint, I just grabbed a set. Mark made mine work even though they were less than ideal. They didn't walk out yet but I don't want them to and have my trigger take a crapper on me.

    PB
    Last edited by Pappabear; 07-12-19 at 14:34.
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

  3. #23
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    Does it still short stroke without the suppressor?

    Quote Originally Posted by markm View Post
    We haven't dug into the gassing on this gun at all. I'm reluctant to tear a gun apart if I don't need to.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  4. #24
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    We haven't pulled the can off. We may give that a try next shoot.
    "You people have too much time on your hands." - scottryan

  5. #25
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    6.5 in an 18" barrel makes me cringe a bit... But even when you lose ~100 (or more!) FPS, the 6.5 round really still performs. Even out at 1000m, you're only looking at a little over 1 mil elevation and under a half mil of windage in 10 mph full value cross winds. Even when seeking to optimize the barrel length, the reality is that the external ballistics on secant ogive 6.5 projectiles are just... good.

    I am really very interested in seeing what you guys can squeeze out of this particular rifle, especially when you stretch the range out a bit. I'd love to see that data set along side a .308 semi , if you have one in inventory between the two of you (which, somehow, I am sure you do).
    Last edited by noonesshowmonkey; 07-17-19 at 00:28.

  6. #26
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    I hope we can get back out in a few weeks. The weather is too hot, and Pappabear is healing up.
    "You people have too much time on your hands." - scottryan

  7. #27
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    Quote Originally Posted by noonesshowmonkey View Post
    6.5 in an 18" barrel makes me cringe a bit... But even when you lose ~100 (or more!) FPS, the 6.5 round really still performs. Even out at 1000m, you're only looking at a little over 1 mil elevation and under a half mil of windage in 10 mph full value cross winds. Even when seeking to optimize the barrel length, the reality is that the external ballistics on secant ogive 6.5 projectiles are just... good.

    I am really very interested in seeing what you guys can squeeze out of this particular rifle, especially when you stretch the range out a bit. I'd love to see that data set along side a .308 semi , if you have one in inventory between the two of you (which, somehow, I am sure you do).
    We can swing that I have a 16 inch LMT MWS in 308, and the 6.5 in both 18 inch and 20 inch (20 being MWS). Might have to do full scale trial. But need to toss a NF on the Colt for a day.

    And just like many folks would argue its stupid to have a 16 inch gas gun in 308, but it works.

    PB
    Last edited by Pappabear; 07-17-19 at 21:10.
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

  8. #28
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    6.5 creedmoor has a different pressure curve and likes to pierce primers in AR-10's just make sure the gun your getting in 6.5 has a high pressure bolt. I just finally threw in the towel on mine and ordered a JP high pressure bolt because I was tired of that issue.
    Last edited by Kansaswoodguy; 07-18-19 at 22:18. Reason: Grammer

  9. #29
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    Which gun and gas system?

    Quote Originally Posted by Kansaswoodguy View Post
    6.5 creedmoor has a different pressure curve and likes to pierce primers in AR-10's just make sure the gun your getting in 6.5 has a high pressure bolt. I just finally threw in the towel on mine and ordered a JP high pressure bolt because I was tired of that issue.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  10. #30
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    Quote Originally Posted by markm View Post
    I hope we can get back out in a few weeks. The weather is too hot
    That's no MFing joke! I looked at my round count books and always seen a YUGE drop off to nearly nothing from late May through mid-Sept. Only time I really go is to do something specific like zero a new scope, then I'm there for the minimum time required. Handgun practice moves to the indoor range.
    - Rhino

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