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Thread: Stupid Question: 12.5" + 4" linear comp?

  1. #21
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    Quote Originally Posted by Bimmer View Post
    Hi all,

    I've been here for years... I'm fooling with the idea of building a non-NFA upper with a 12.5" barrel and a Kaw Valley Precision "XL" linear comp, which is 4.125". Nevermind the NFA issues: I would make sure that it's a full 16" and have it pinned and welded.

    My question is whether this is a fool's errand. This seems appealing because I like the idea of a suppressed SBR, but I live in California and it's impossible. (Trolls: Spare me the anti-California rants.)

    So, I can get a linear comp, and KVP's new "XL" is huge and should at least direct much of the blast/flash away from me, in the SHTF event that I need to fire the gun indoors.

    Alternatively, I could do a 14.5" barrel with a regular linear comp pinned and welded, but it seems like the bigger linear comp would do better directing blast forward, and the 2" of barrel length doesn't seem like enough to matter in terms of muzzle velocity (maybe 150fps?).

    Please advise...
    I personally think you are overthinking this. I personally would just get a good 16" barrel carbine or middy and call it a day. The chances of you engaged in an indoor SHTF event is minimal and even if you were, a semi auto AR is not a particularly high flash weapon anyway and I just think you are spending a lot of extra money and losing velocity and flexibility for a non-issue concern of directing muzzle flash forward.

  2. #22
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    Quote Originally Posted by SomeOtherGuy View Post
    I hadn't noticed the XL was only for pistol calibers until you said so...
    Aha... I had noticed that it was advertised for pistol calibers, but I thought that was simply pointing out that the exit hole would be big enough to clear 9mm.

    I hadn't realized that it's made out of aluminum. You guys are right that that's a deal-breaker.

    FWIW, I have a KVP linear comp (the little steel one) on a 17HMR, and it's a nice piece. It's hard to know how much it's reducing the (already minimal) muzzle blast for me, because I didn't do back-to-back comparisons with/without. I have it in case I get a shot at a crow without ear protection...

  3. #23
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    Quote Originally Posted by SomeOtherGuy View Post
    I hadn't noticed the XL was only for pistol calibers until you said so. Looks like the description says it's for pistol calibers, but the threadings offered are compatible with typical rifle barrel threads, see below. I suspect this is a case of "we don't recommend you do ___, but we aren't stopping you from doing ___."
    Thread Types: 1/2x28 TPI, 5/8x24 TPI, 1/2x36 TPI, .578x28 TPI

    While these may also be rifle barrel thread patterns 1/2x28 and 1/2x36 are also 9mm thread patterns and 5/8x24 and .578x28 are also common 45 acp thread patterns.

    I wouldn't recommend a MD designed for a pistol caliber be used on a 556 rifle.
    Last edited by bighawk; 11-18-16 at 03:44.

  4. #24
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    I think I would want to know what the difference in blast between a 16" barrel and the 12.5" with linear doohickey would be. It might be that difference might not be huge. Maybe the 16" might be less blast or only slightly more. If that is the case then I would stick with the 16".

  5. #25
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    Bimmer, have you shot a 16 inch gun indoors? Outside of the noise, which is going to be horrendous either way, its not that bad.

    I spent 3 hours today in a shoot house training CQB active shooter type stuff. Everyone was running our patrol rifles which are Colt 6920s. I had multiple instances being in a 15x10 foot room shooting targets with two other guys right next to me doing the same. Yeah you can feel the blast but it isnt disorienting at all and in the moment, when I was thinking more about clearing the rooms, I really didn't even notice it.
    C co 1/30th Infantry Regiment
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  6. #26
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    Quote Originally Posted by TED View Post
    I think I would want to know what the difference in blast between a 16" barrel and the 12.5" with linear doohickey would be...
    Yes, basically, this was my question, and not having the two to compare, I was hoping for some insight...


    Quote Originally Posted by C-grunt View Post
    Bimmer, have you shot a 16 inch gun indoors?
    No, I'm basically a middle-aged mall ninja... However, I've been to indoor ranges where people were shooting centerfire rifles, and the concussion was impressive.

  7. #27
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    Good catch on the "pistol" comp. Reminds me of a company that sold the "Disintegrator" comp a few years ago that disintegrated during T&E... oops.

    Don't forget that some barrels are longer than advertised. Some folks get 14.5" barrels that measure 15", so the pinned muzzle devices options to get to 16" are plentiful. Maybe try and find a ~15" and pin a normal device.

  8. #28
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    Quote Originally Posted by Rayrevolver View Post
    Some folks get 14.5" barrels that measure 15", so the pinned muzzle devices options to get to 16" are plentiful. Maybe try and find a ~15" and pin a normal device...
    Well, I'm thinking of what to put on a BCM lower, so I'm looking at BCM uppers (almost exclusively), and the options there are 12.5, 14.5, or 16.0...

    Linear comps are usually 2" or or so, so a 14.5" barrel is no problem.

  9. #29
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    Quote Originally Posted by Bimmer View Post
    Well, I'm thinking of what to put on a BCM lower, so I'm looking at BCM uppers (almost exclusively), and the options there are 12.5, 14.5, or 16.0...

    Linear comps are usually 2" or or so, so a 14.5" barrel is no problem.
    I had a 14.5" BCM BFH Middy, it was the best shooting gun I owned. It measured 14.8" so I pinned on a standard A2.
    Quote Originally Posted by JSantoro View Post
    Stop dicking the dog, please. It's gross.

  10. #30
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    Quote Originally Posted by Ryno12 View Post
    I had a 14.5" BCM BFH Middy... it measured 14.8" so I pinned on a standard A2.
    I guess I could do this... Just order a 14.5" from BCM, and then measure it when it arrives. I'm surprised that their barrel came in 0.3" over advertised.

    Since the 12.5" and 4" comp isn't a viable option, now I'll go back to the drawing board. (Don't worry, I'll be back with more stupid questions later.)

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