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Thread: Question for BCM 14.5 Mid users

  1. #21
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    Quote Originally Posted by david.bergen View Post
    What range are we talking here ?
    Smallest to largest?
    Hard to say. You would have to own all the barrels out there (that are in this config) in order to get a range.


    C4

  2. #22
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    I am going to turn my own from a barrel blanc and was wondering about gas port sizes. I live in Belgium (europe) and getting parts is very difficult. We are trying building our own stuff.

  3. #23
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    Quote Originally Posted by david.bergen View Post
    I am going to turn my own from a barrel blanc and was wondering about gas port sizes. I live in Belgium (europe) and getting parts is very difficult. We are trying building our own stuff.
    Start at .0625"-.063" and go up from there until it works reliably. That's the size of a Mil-spec gas port on a CAR gas 14.5" M4 barrel.

    Most commerically produced midlength barrels are from .085"-.100" and most are way overgassed.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #24
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    So when I start with the carbine size port and the weakest ammo. (wolf 55) It shouldn't work. If I then enlarge till BCG locks to the rear
    I am good to go. If I start with a carbine buffer I always can go to a heavier buffer for shooting mil spec ammo. Is this the correct thinking?
    When testing the rifle should I set it very firm in the shoulder or use a very loose grip. We found it makes a difference when adjusting the gasblock on a IPSC rifle.

  5. #25
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    We bought a 14.5" middy from BCM to update an old M16-A1 at work. The gun ran great with about 500 rounds of Federal 55 grain 5.56mm FMJ. This was with a rifle buffer. I've not shot it another officer had it for a two day pistol/carbine class. Our guns ran great it made me smile, 3 LMT SBR's and this BCM SBR.
    "Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree

  6. #26
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    Quote Originally Posted by gotm4 View Post
    My BCM 14.5" optimized gas system gun runs just fine on PMC. I'm using a CMT H buffer, LMT enhanced carrier with a BCM carrier key, BCM bolt, cam pin and firing pin and with PMC it locks back every time. With the AAC Brakeout it shoots very soft with very little muzzle rise.
    The next ammo I need to try is Wolf, Remington/UMC and Radway Green.
    I had a question..., does optimized gas system mean that the gas port was optimized for the type of ammo you wanted to run?

  7. #27
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    Quote Originally Posted by f.2 View Post
    I had a question..., does optimized gas system mean that the gas port was optimized for the type of ammo you wanted to run?
    No. It's optimized for a 14.5" barrel using a midlength gas system, it works with 5.56mm NATO ammo and .223 Rem (SAAMI spec) ammo. It has a smaller port than other midlength barrels. Just enough to run and not short stroke which makes is shoot very soft. It runs a lot cleaner and a tad cooler as well. I'm using a H buffer with mine along with an AAC Brakeout comp/flash hider.
    For bolt carriers I'm using it with a BCM M16 BCG. It shoots incredibly soft. Getting an AR to be reliable and shoot soft is a fine science. Too much gas and it'll run with weak ammo. Too little and it'll short stroke. Too heavy of a BCG and it can short cycle, too light and it runs out of rearward momentum too soo and also won't feed as well. The optimized BCM uppers are meant for a .223 and 5.56 with M16 BCGs and H or CAR buffers. Combined with a comp like a KAC Triple Tap or PWS FSC556 makes for a really nice soft shooting upper which is dead nuts reliable. Mine has a BCM hammer forged barrel.

    My 3gun rifle is also 'optimized/tuned', it's a BCM 16" midlength SS410, pinned VLTOR stainless gas block, BCM M16 BCG, Surefire muzzle brake (MB556AR), and a BCM H buffer.

    My 12.5" BCM is also very soft shooting, it's a standard BCM chrome lined barrel with CARbine length gas. I pinned a Troy gas block on it. Installed a 11" Troy/VTAC FF tube. Installed my KAC Triple Tap, BCM M16 BCG, BCM H buffer. It shoots very soft with .223 pressure ammo or 5.56mm NATO pressure ammo. I sighted in it with Mk262 last night at 50yds and from the Federal AE223 55gr 50yd zero it only needed 1 click of windage to correct the POI. I'm using an Aimpoint C3 2MOA in a LaRue LT150 mount, DD fixed front sight and a BCM/Troy flip down rear sight.
    Last edited by Robb Jensen; 06-12-10 at 12:13.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  8. #28
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    I friggin' LOVE my 14.5" BCM Middy! It just feels, right. If that makes sense?

    Here's mine in action from when me and thopkins22 went out to the range 2 days ago. It's me running a modified version of the Magpul Dynamics BSA Drill (I was limited to a 25-yard range), running my 14.5" BCM middy and using my new (well, "new" to me anyways) ContourHD 720p helmet cam to record the video.
    S/F
    Paul

  9. #29
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    GotM4

    How is your AAC attached? Is it on an SBR? I'd like to perm my AAC and was thinking of doing it myself. I read a how to article about using Brownells heat stop paste and silver solder. I'd like the freedom to put it on a non SBR lower. The ability to have it reversed w/o damage as a plus too. What would you charge to do it for me? Looks like I could have it done professionally for about what I'd spend in gear and I'd know it was done right.

    Thanks
    "Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree

  10. #30
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    i have the bcm 14.5 mid with a pws and H buffer and it ran 50 rds of .223 soft point with no hiccups.

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