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11.5" BCM vs 12.5" Geissele Huxwrx Flow 556 Builds

padom

padom

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Minuteman
    • Mar 13, 2013
    13,564
    10,594
    Southeastern, Pennsylvania
    #1
    I just bought a Huxwrx Flow 556... wanted to test these eForm4's shipping a can right to your door. Sure enough, its legit, approved in 4 days...

    So i decided to build and submit a new eform 1 sbr lower for this build. And build a 11.5" BCM upper and a 12.5" Geissele upper.


    Here the build specs


    Lower

    Spikes Tactical Spider Lower
    Geissele Buffer Tube
    Geissele H3 buffer/spring combo
    Geissele trigger guard
    Geissele Maritime bolt catch
    BAD Pro Ambi Safety
    Geissele lower parts kit
    Magoul MOE K2+
    Larue MBT- 2S Straight w/JP spring
    Magpul CTR
    BCM QD Endplate
    Forward Controls Billet Castle Nut


    Geissele Upper
    12.5" Geissele chrome lined CHF barrel
    9.3" Geissele SMR MK16 handguard
    Geissele Super Compact gas BLOCK
    Geissele Super Charging Handle
    Spikes Tactical melonited gas tube
    Rubber City Armory BCG
    Magpul VFG


    BCM Upper
    11.5" BCM Chrome lined barrel
    10.5" BCM MCMR MLOK Handguard
    BCM 750 gas block
    Spikes Tactical melonited gas tube
    BCM Gunfighter Ambi charging handle
    Rubber City Armory BCG
    Magpul VFG

    GBRS Lerna mount
    Aimpoint T2

    I just put some Hornady 55 FMJ-BT WC846 bulk plinking ammo through the Geissele upper today on one of my other SBR lowers to zero at 50yd and put some rounds down in.

    Functioned flawlessly..... just waiting for the Huxwrx to show up in the mail then I'll start doing some testing.

    I also have a 11.5" piston upper i built with a Superlative Arms piston kit that is very smooth ill be testing the Huxwrx on and comparing to these 2 uppers.


     
    • Like
    Reactions: simonp, Coffee_and_Pipes, WeR0206 and 2 others
    #5
    it seems like an “emperor’s new clothes” situation with the ever increasing height of optic mounts.

    I do like the upper, and if the optic setup works well for you, I’m all for it. Super cool that suppressors can come in the mail, I have a Hux showing up shortly.
     
    #6
    Evolution 9 said:
    it seems like an “emperor’s new clothes” situation with the ever increasing height of optic mounts.

    I do like the upper, and if the optic setup works well for you, I’m all for it. Super cool that suppressors can come in the mail, I have a Hux showing up shortly.
    Click to expand...

    Honestly, I thought it looked weird as hell. Ran it today for the first time and its very nice.

    Super fast dot acquisition with a full heads up normal posture. Zero movement of the head or body to find or get behind the dot. The concept works. I was hesitant but I like it a lot. I was so hesitant before shooting it i got a unity mount just in case... hahaha
     
    Last edited:
    #7
    padom said:
    I just bought a Huxwrx Flow 556... wanted to test these eForm4's shipping a can right to your door. Sure enough, its legit, approved in 4 days...

    So i decided to build and submit a new eform 1 sbr lower for this build. And build a 11.5" BCM upper and a 12.5" Geissele upper.


    Here the build specs


    Lower

    Spikes Tactical Spider Lower
    Geissele Buffer Tube
    Geissele H3 buffer/spring combo
    Geissele trigger guard
    Geissele Maritime bolt catch
    BAD Pro Ambi Safety
    Geissele lower parts kit
    Magoul MOE K2+
    Larue MBT- 2S Straight w/JP spring
    Magpul CTR
    BCM QD Endplate
    Forward Controls Billet Castle Nut


    Geissele Upper
    12.5" Geissele chrome lined CHF barrel
    9.3" Geissele SMR MK16 handguard
    Geissele Super Compact gas BLOCK
    Geissele Super Charging Handle
    Spikes Tactical melonited gas tube
    Rubber City Armory BCG
    Magpul VFG


    BCM Upper
    11.5" BCM Chrome lined barrel
    10.5" BCM MCMR MLOK Handguard
    BCM 750 gas block
    Spikes Tactical melonited gas tube
    BCM Gunfighter Ambi charging handle
    Rubber City Armory BCG
    Magpul VFG

    GBRS Lerna mount
    Aimpoint T2

    I just put some Hornady 55 FMJ-BT WC846 bulk plinking ammo through the Geissele upper today on one of my other SBR lowers to zero at 50yd and put some rounds down in.

    Functioned flawlessly..... just waiting for the Huxwrx to show up in the mail then I'll start doing some testing.

    I also have a 11.5" piston upper i built with a Superlative Arms piston kit that is very smooth ill be testing the Huxwrx on and comparing to these 2 uppers.


    Click to expand...

    Nice builds! I have a lot of similar parts on a few of my own builds. Those bcm qd end plates are a great deal at like $15 or whatever they are these days. I don’t usually use it but its nice to have just in case.

    In my head this was you waiting for someone to ask about the mount…

    giphy.gif
     
    #8
    WeR0206 said:
    Nice builds! I have a lot of similar parts on a few of my own builds. Those bcm qd end plates are a great deal at like $15 or whatever they are these days. I don’t usually use it but its nice to have just in case.

    In my head this was you waiting for someone to ask about the mount…

    giphy.gif
    Click to expand...

    🤣🤣

    Yea it came with no direction and the QR code didnt show orientation like unity mount directions do. But I looked up some pictures and found it flipped around. The Pic was the only one I had from earlier today... its flipped around now.hahah

    Yea I love those BCM endplates.
     
    • Haha
    Reactions: WeR0206
    #9
    Well I finally got the gas tube in to complete the 11.5" BCM upper build. My son and I took both of them out Wednesday and put 500rd through them.

    They both shot great but we both agreed the recoil impulse of the 12.5" Geissele on the new sbr lower with Geissele H3 buffer is just a little more smoother.

    I brought another one of my sbr lowers with us that has an H2 buffer and there was a noticeable difference in felt recoil impulse with that H2 lower, especially with the 11.5" BCM upper.

    The Huxwrx shipped yesterday so I will have it next week. We will see how they both shoot with the new can on them.

    Also, we were just shooting my M193 clone Hornady 55 FMJ-BT with WC846 that chronos at 2900 out of my 16" AR's. My goal to range practice load.

    Will test some different types of ammo with the can like M855, 55 VMAX, 60 TMK, 62 JSP, 77smk and 77 TMK.
     
    • Like
    Reactions: simonp
    #10
    I also pulled my gas piston 11.5" upper I built out of the safe to test against these 2 uppers with this new Huxwrx can today

    BCM MOD4 Thermotfit upper receiver
    11.5" 416SS Green Mountain 1-7 5.56 barrel
    BCM MCMR 10" MLOK handguard
    Rubber City Armory BCG
    Superlative Arms Carbine Length Gas piston kit
    Geissele Super Charging Handle
    SIG Romeo4T Pro


    I put a Huxwrx 5.56 flash hider QD adapter on all 3 uppers. All were shot with my M855 clone load run on my automated 5.56 1050 which consists of M855(SS109 pulls), new primed LC brass (pulled) and WC846 (3066 SD 7 out of my 16" Wilson Combat barrel).

    I have about 500rd through the two newly built 12.5 Geissele and 11.5 BCM uppers the past few weeks on the new lower. Without a can, the 12.5" upper was just noticeably slightly smoother shooting than the 11.5...

    Today we shot all 3 uppers with the new can and they all shot great, but there was just a noticeable difference in lack of recoil and how smooth the impulse was with the Huxwrx on the 11.5 SLA piston upper. Its so nice to shoot and there is no recoil and zero gas in your face or back into the gun. Also, this 11.5" 416SS GM barrel is very accurate with this M855 clone load Not gonna last as long as the other 2 barrels but for the cost, ill gladly replace it when it falls off.


    1QeOI8x.jpeg
     
    Last edited:
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