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Thread: 14.5" Recce/"Do-all" build conundrum

  1. #11
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    I plan on sticking with a mil-spec re/buffer type setup.

  2. #12
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    With a can on, you can run a h3 with springco blue on a 14.5" middy and run everything. Now if you take off the suppressor... Likely it won't work so well with weak ammo.
    "I never learned from a man who agreed with me." Robert A. Heinlein

  3. #13
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    Quote Originally Posted by Koshinn View Post
    With a can on, you can run a h3 with springco blue on a 14.5" middy and run everything. Now if you take off the suppressor... Likely it won't work so well with weak ammo.
    That's about what I would have guessed - I'm running an H2/Springco Blue on a 16" Middy, but that's a reflex can (M4-S) that probably isn't providing that much backpressure. If mil RE/buffer is the requirement, it's not going to be super smooth and still run crap, at that point if you still need it to run Tula/Silver Bear/Wolf without changing the buffer/spring, then carbine/H buffer is probably the closest thing to a good answer. Otherwise, I'd say run a sprinco Blue, H2 or H3 as your primary setup, and keep a standard spring and a lighter buffer for when you need to run it with lower pressure stuff sans can, since the latter are cheap parts (in that in one afternoon, the savings in ammo cost can basically pay for the CAR/H buffer and stock spring).
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  4. #14
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    Quote Originally Posted by TehLlama View Post
    That's about what I would have guessed - I'm running an H2/Springco Blue on a 16" Middy, but that's a reflex can (M4-S) that probably isn't providing that much backpressure. If mil RE/buffer is the requirement, it's not going to be super smooth and still run crap, at that point if you still need it to run Tula/Silver Bear/Wolf without changing the buffer/spring, then carbine/H buffer is probably the closest thing to a good answer. Otherwise, I'd say run a sprinco Blue, H2 or H3 as your primary setup, and keep a standard spring and a lighter buffer for when you need to run it with lower pressure stuff sans can, since the latter are cheap parts (in that in one afternoon, the savings in ammo cost can basically pay for the CAR/H buffer and stock spring).
    A 16" middlength gas system has the same length of barrel past the gas-port as does a 14.5" carbine system. Lots less data to pull from once you throw that out there, as 16" and 14.5" barrels behave differently with the same length gas systems on them.


  5. #15
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    You have been a member for quite a while-

    The custom build area is a place to show off/discuss and ask questions and get feedback about your completed custom build (this means a completed AR that is functional and already completed). If you are going to post pictures of your build, please post a complete picture not just your parts, partial lowers, etc....

    Also, buying an upper separate and then a lower and throwing them together does not constitute a custom build. It would be nice if you took time to explain how you came to your decision and explain your set up. Thanks.

    If you do not follow the guidelines and your post disappears it's probably because it was moved to the trash or deleted.



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  6. #16
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    Quote Originally Posted by Iraqgunz View Post
    You have been a member for quite a while-

    The custom build area is a place to show off/discuss and ask questions and get feedback about your completed custom build (this means a completed AR that is functional and already completed). If you are going to post pictures of your build, please post a complete picture not just your parts, partial lowers, etc....

    Also, buying an upper separate and then a lower and throwing them together does not constitute a custom build. It would be nice if you took time to explain how you came to your decision and explain your set up. Thanks.

    If you do not follow the guidelines and your post disappears it's probably because it was moved to the trash or deleted.
    Thank-you. Understood.

    How did I come to my decision? Specifically regarding my choice of barrel length and optics, or...?

  7. #17
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    It seems silly to me that you're already having an NFA upper and you want a "do it all" rifle but you're not looking at the 12.5"
    Why do the loudest do the least?

  8. #18
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    ^^this is what I'd be doing if i were in his shoes. 12.5 with a variable optic. Then again he did touch on the 12.5 in post #8 and how it trades off more velocity than he would like.
    WS6, i know you said youre set on a 14.5 for better or worse but I remember reading a post about constructor's 12.5 1/8 5R barrel yielding higher velocities than a 14.5.

  9. #19
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    Quote Originally Posted by Col_Crocs View Post
    ^^this is what I'd be doing if i were in his shoes. 12.5 with a variable optic. Then again he did touch on the 12.5 in post #8 and how it trades off more velocity than he would like.
    WS6, i know you said youre set on a 14.5 for better or worse but I remember reading a post about constructor's 12.5 1/8 5R barrel yielding higher velocities than a 14.5.
    Understood, but the extra 2" of powder burn is going to make it much nicer to shoot unsuppressed, as well as kinder to my suppressor (I refuse to run a brake, see the first half of this sentence). It's not just velocity I'm looking at, but powder-burn, concussion, blast, etc.

    I really just have no use for a shorty anymore after getting some actual trigger-time in and around vehicles. I actually think I prefer a 14.5"-16" gun in a car at this point.

    This is my reason for the 14.5" barrel.

    -Concussion (for my sake)
    -Powder-burn (for the sake of the suppressor)
    -Velocity (goes hand-in-hand with the above 2, and while a polygonal rifled barrel would fix this, it does nothing for the other 2 aspects).

    Another aspect is that I am stuck on the DDM4 rail. It's about the same weight as a slick Troy Alpha of the same weight (including barrel nut), and I like at least 10" of rail on the small side, especially with how I want to run the SR tapeswitch. The DDM4 rail comes in 9" and 12" lengths, respectively.

    The reason I have not considered the KMR and other rails is that I perceive (I have not shot one) that they heat up faster, and I have gotten my DD rails plenty hot as-is, to the point that I am glad I wear gloves and cover them in Index-clips. Also, the VFG's currently on the market interface "smoother" with the 1913 rail when you butt index clips up against them. I use my VFG as a hand-stop, as well as a "tool" for stand-off and on my ankle, and other things when doing 1-handed drills (A'la VTAC), which is why a simple hand-stop won't work for me. The BCM Shorty VFG is PERFECT for me. I just like the 1913 interface, at this time, is all I'm saying. The lightest 1913 rail I know of is the DDM4 (12oz for a 12" rail, including barrel nut, I believe), thus, another reason I am looking at the 14.5" barrel. A 12" rail won't work on a 12.5" barrel, esp. considering the DDM4 rail is 12.44", "technically".
    Last edited by WS6; 04-17-14 at 08:13.

  10. #20
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    Quote Originally Posted by WS6 View Post
    Understood, but the extra 2" of powder burn is going to make it much nicer to shoot unsuppressed, as well as kinder to my suppressor (I refuse to run a brake, see the first half of this sentence). It's not just velocity I'm looking at, but powder-burn, concussion, blast, etc.

    I really just have no use for a shorty anymore after getting some actual trigger-time in and around vehicles. I actually think I prefer a 14.5"-16" gun in a car at this point.

    This is my reason for the 14.5" barrel.

    -Concussion (for my sake)
    -Powder-burn (for the sake of the suppressor)
    -Velocity (goes hand-in-hand with the above 2, and while a polygonal rifled barrel would fix this, it does nothing for the other 2 aspects).
    Have you ever shot a 12.5"? Blast with a FH is similar to a 14.5". If there is more concussion, it isn't noticeable. And I've fired a bunch of rounds through my 12.5" with both an M42000 and 762SD with no issues on the first baffle.

    The velocity loss is 100fps or so. Is that really going to matter?

    Its your rifle, and you can do with it as you wish. I've had 14.5" and 16" "do it alls", but without a doubt my favorite is the 12.5"

    It shoots to 565 yards just as well as the 14.5" with no trade offs.
    Last edited by Eurodriver; 04-17-14 at 08:13.
    Why do the loudest do the least?

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