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Thread: BCM MK12 or BCM RECCE for Precision Upper

  1. #11
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    Quote Originally Posted by ScatmanCrothers View Post
    When deciding on an upper?

    Well, I meant most precision rifles utilize some sort of tuned trigger, would you build a spr with a g.i trigger? ( not being an ass, im just tryna get my thought across). Staying on topic, id say mk12 upper. Also, I have it understood that using the correct ammo makes a day and night difference when shooting spr's???

    ETA: I think Trident hit the nail on the head.
    Last edited by SilverBullet432; 02-20-14 at 14:05.

  2. #12
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    Quote Originally Posted by SilverBullet432 View Post
    Well, I meant most precision rifles utilize some sort of tuned trigger, would you build a spr with a g.i trigger? ( not being an ass, im just tryna get my thought across). Staying on topic, id say mk12 upper. Also, I have it understood that using the correct ammo makes a day and night difference when shooting spr's???

    ETA: I think Trident hit the nail on the head.
    Understood. I like my SD-E for what it is but there are plenty of shooters out there that would put me to shame with a QMS on a similar setup on a consistent basis. I get what you're saying though, also a part worth considering on his rig.


    Quote Originally Posted by TehLlama View Post
    Not completely irrelevant, but in this case it's a pair of uppers that do make the shooter the most likely weak link.

    The Recce, especially with 77gr or 69gr SMK will do everything you want out to 500 just as well, in a slightly lighter package. Might be honestly worth putting the KMR handguard on the BCM recce, since that complete upper is right in the range of minimum weight for the performance out to 600m, since most of the weight is the barrel. They're in stock ATM as well.

    While there's nothing wrong with the 18" units, I have two 18" SPRs and I find myself using my 16" because it's a bit handier.
    I'd say the 16 too. They'd both reach out to the distances desired. Working up a load with the 77 SMKs would give more of a benefit than the extra two inches/increased weight. I've had some really good results out of a couple VV powders and Varget/400 primers, crimped, but results vary from my different setups. Wish I was deciding between a new spr/recce to start the paces all over again with...

  3. #13
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    Yeah right now either upper would go on a stock colt 6920 lower, but my next project is to build it's own lower with a SSA-E. I really appreciate all the input from everyone.

    Does anyone have any experience with BCM's ionbond coating they put on the SS410 barrels? I honestly like the bare stainless look better but if the coating has some significant advantages I might go with it instead of the plain stainless finish.

  4. #14
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    Quote Originally Posted by Malletor View Post
    Yeah right now either upper would go on a stock colt 6920 lower, but my next project is to build it's own lower with a SSA-E. I really appreciate all the input from everyone.

    Does anyone have any experience with BCM's ionbond coating they put on the SS410 barrels? I honestly like the bare stainless look better but if the coating has some significant advantages I might go with it instead of the plain stainless finish.
    Run the bare stainless if you like it, it's just fine. Ionbond is nice for a harder use barrel, I guess, but in that application it doesn't do much more than a parkerize treatment, and neither does much more than bare SS if you clean it each trip, as I suspect a precision upper my warrant for you.
    The SSA-E (or, if you intend to stick with just one lower, you'd be truly amazed at how good the SSA is for light precision work, yet still 100% capable as a defensive carbine - if you want to run one lower and two uppers, I'd go SSA - two lowers, still an argument to be made for SSA) is an amazing trigger - just be aware that getting one Geissele trigger will incur the desire for another if you have a second lower. I liked my first so much, I'm now down to just two triggers that aren't a GSSA or GSSA-E - and they're KAC NM units.

    A far as length - you have to be out where velocity matters, or shooting quick enough split times where tenths matter to see where the rifle gassed 18" units can outperform the 16". With heavier rounds, that velocity difference isn't as key until you're focusing on shooting MOA past 500yd where that bit of velocity can help deal with wind, but it has a lot more to do with minimizing how much adjustment is required from the shooter.

    If budget is a major requirement, I'd look seriously at upgrading the Colt lower (SSA, better stock such as a SOPMOD type) since that's an upgrade which improves the performance of both uppers you'd own, and can certainly be kept on the 6920 as funds allow for completing the next rifle.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

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    Quote Originally Posted by TehLlama View Post
    Not completely irrelevant, but in this case it's a pair of uppers that do make the shooter the most likely weak link.

    The Recce, especially with 77gr or 69gr SMK will do everything you want out to 500 just as well, in a slightly lighter package. Might be honestly worth putting the KMR handguard on the BCM recce, since that complete upper is right in the range of minimum weight for the performance out to 600m, since most of the weight is the barrel. They're in stock ATM as well.

    While there's nothing wrong with the 18" units, I have two 18" SPRs and I find myself using my 16" because it's a bit handier.
    What is the minimum weight for an upper for performance out to 600m?

  6. #16
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    I'm too busy this evening to look it through, but it's going to be at least a 1.5lb barrel in 16" length, probably closer to 2lb, with muzzle device, gas block, gas tube, upper, BCG, and CH. It's more so that anything lighter than the BCM KMR setups are likely running a thinner profile barrel, which is likely a reduction in potential precision, since there isn't anywhere else with available parts worth trying to shave off significant weight off an AR at the moment.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

  7. #17
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    My less than rigorous look at the 16" Stainless barrel offerings awhile back showed that most 16" SS barrel weights hovered around the 2lb range, give or take a few ounces depending on the profile.

  8. #18
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    Quote Originally Posted by LewP View Post
    My less than rigorous look at the 16" Stainless barrel offerings awhile back showed that most 16" SS barrel weights hovered around the 2lb range, give or take a few ounces depending on the profile.
    Yup... I just spent about a month researching 16in. SS barrels and found that most of them were 32+ ounces. I wanted to do a RECCE build on the lighter side of things so I ended up finding a Rainier Select which weighs exactly 30 ounces. I'm going to pair it up with a 13" KMR which should make for a relatively light all purpose build.

    Sent with a Gen 2 Nexus 7

  9. #19
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    Don't worry too much about a couple ounces, especially on a precision rifle. It helps to not have it be a boat anchor, especially towards the muzzle end, but it's not like the Rainier Select is a slouch - I just almost always have the feeling that for a precision rifle, there's some value in the expensive ones because it can delay next-rifle-itis. That with a KMR is going to be in the weight range of cheaper non-precision rifles, so most of the cost is likely to be an optic capable of that impressive capability range. Just under 9lb depending on optic/stock setup, and it does everything 5.56 excels at.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

  10. #20
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    Quote Originally Posted by TehLlama View Post
    Don't worry too much about a couple ounces, especially on a precision rifle. It helps to not have it be a boat anchor, especially towards the muzzle end, but it's not like the Rainier Select is a slouch - I just almost always have the feeling that for a precision rifle, there's some value in the expensive ones because it can delay next-rifle-itis. That with a KMR is going to be in the weight range of cheaper non-precision rifles, so most of the cost is likely to be an optic capable of that impressive capability range. Just under 9lb depending on optic/stock setup, and it does everything 5.56 excels at.
    Yea, I guess you could say I'm going for a all purpose set up rather than a precision build. I just wanted to build something MOA accurate without being a pain in the ass to run and gun with.

    I was thinking about using a SWFA SS 1x6.

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