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Thread: A lightweight Mk12 off-shoot concept. "The handy rifle"

  1. #21
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    Quote Originally Posted by rauchman View Post
    Bufford & Mikem, very very cool setups.

    Bufford, what kind of accuracy expectations do you have with your rifle? I've never owned / shot an 18" with rifle gas, however I've read that some think there are concerns w/ reliability. Any reliability issues with your setup?

    This looks an ideal modern day expression of the original M16A1, or general purpose rifle w/ more range expectation over an M4. Excellent setup!
    I don't know what kind of reliability he has with his rifle but from experience, and 18" rifle gas is very soft shooting. It's 100% reliable as long as you choose the right buffer set up and use good ammo.

    They can however be iffy when it comes to lower powered ammo such as cheap steel case or PMC. For 3 gun matches where you can control the ammo you're feeding it, you likely won't find a better set up but if you're into SHTF, it's not a good set up since you won't have control over which ammo you come across.

  2. #22
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    Quote Originally Posted by ffusaf23 View Post
    BTJ - I like both the concept and the end result. I believe I'm now inspired to do something similar but with a low-powered variable optic. Don't forget to update the thread with pics of the KMR installed!

    I may be wrong but it seems that the rear MBUS is not at the farthest aft position...is there a reason for this?
    Yes, there is a reason. It's because my gloves were catching on it when charging. One more pic-notch forward and problem solved.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  3. #23
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    Quote Originally Posted by rauchman View Post
    Bufford & Mikem, very very cool setups.

    Bufford, what kind of accuracy expectations do you have with your rifle? I've never owned / shot an 18" with rifle gas, however I've read that some think there are concerns w/ reliability. Any reliability issues with your setup?

    This looks an ideal modern day expression of the original M16A1, or general purpose rifle w/ more range expectation over an M4. Excellent setup!
    I haven't tested with .223 ammo yet, but those exact same things were said about my BCM 14.5" middy. But I ran an A5H4 buffer in that puppy and it even worked with a springco green spring.

    With an A5H3 buffer, LMT E-carrier (which I've found helps reliability with all ammo), I'm fairly confident that it will work fine with std power .223 ammo. I think that some of the problems that people have had with 18" barrels in the past have been as a result of their chambers being on the tight side of the spec (for accuracy). This just has a std 5.56 NATO chamber in the FN made barrel. So, I don't anticipate any trouble. I'll keep this thread updated with any issues I might have.

    However, if I do encounter any issues, I have TONS of buffer weight to drop to try and make things work.

    And, to be honest, all my practice ammo is either XM193 or XM855....so functioning with lower powered ammo isn't a requirement for me, though it's nice to have the headroom in the energy budget of the operating system.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

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  4. #24
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    The gas port size also has a lot to do with reliability and weaker powered ammo.

  5. #25
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    Quote Originally Posted by Obscenejesster View Post
    The gas port size also has a lot to do with reliability and weaker powered ammo.
    Correct. My barrel has a .098 gp...which is the common size for 18" barrels with rifle gas.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  6. #26
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    BufordT,

    The man I have to blame for buying 2 14.5" barrels last year and experimenting with those barrels and the A5 system. Glad to see those rifle up and running. Looking forward to seeing how it functions with say PMC Bronze. Maybe through in an A5H4 and see what happens??

    -Jax


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  7. #27
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    Quote Originally Posted by jaxman7 View Post
    BufordT,

    The man I have to blame for buying 2 14.5" barrels last year and experimenting with those barrels and the A5 system. Glad to see those rifle up and running. Looking forward to seeing how it functions with say PMC Bronze. Maybe through in an A5H4 and see what happens??

    -Jax
    I'm happy to help (you spend more money).

    Absolutely. I'll throw in the A5H4 for testing as well with weak ammo. Already tested with the H4 using m193 with no issues,.

    Sent from my SPH-D710 using Tapatalk
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  8. #28
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    Quote Originally Posted by Supergyro View Post
    Neat concept and a very cool build. I feel that if it weren't for NFA the AR bbl lengths would go from 14.5 straight to 18. 16 is the shortest you can go without pinning but it's kinda the worst of both worlds.

    Sent from my SCH-I500
    I would argue precisely the opposite, that 16" can really share the best of both worlds if done right.

    A handy 18" that shoots smoothly is probably more closely related to 3-gun rifles, but would still be great at other stuff. As far as a niche worth developing a product for, I would argue not - maybe fluting an existing barrel contour could work if the market supports it, but an intermediate gassed medium contour 16" and good ammunition can do the same thing quite well, and my ban-state type 14.5" Middy with pinned MB uppers go even farther on being lightweight, with the A5 system on the back the time back on target between shots is as much a function of the fact that the rifle is 6# as it is the gas system.
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  9. #29
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    I have a very similar build to the OP, but with a Centurion 16" barrel.



    This has been my project gun over the years, originally conceived as a kind of "do all" carbine with a suite of optics in QD mounts. Very handy rifle, and I think you're on the right path. The Rainier EVO is a very nice handguard, but I am also very interested in the new BCM units. I've been mulling around a 20" government upper, but part of me just thinks the 18" is the way to go.
    "Man is still the first weapon of war" - Field Marshal Montgomery

    The Everyday Marksman

  10. #30
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    Quote Originally Posted by BrigandTwoFour View Post
    I have a very similar build to the OP, but with a Centurion 16" barrel.



    This has been my project gun over the years, originally conceived as a kind of "do all" carbine with a suite of optics in QD mounts. Very handy rifle, and I think you're on the right path. The Rainier EVO is a very nice handguard, but I am also very interested in the new BCM units. I've been mulling around a 20" government upper, but part of me just thinks the 18" is the way to go.
    Nice rifle...If you're planning on going with a chrome lined 18", I don't foresee it being anymore accurate than that 16" Centurion. Unless you want another 100 FPS velocity.

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