Build Thread Requirements for 500m AR-15?

Discussion in 'Semi-Automatic Rifles' started by h4344, Sep 6, 2017.

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  1. h4344

    h4344
    Portland, OR
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    So I had posted here before considering a Remington 700 for my first long range rifle but decided I would like another AR-15 build.

    I have no idea what specifics I might need to achieve decent results at 500m with 5.56 comfortably as I have only built 1 AR before.

    Im wondering about things like twist rate, barrel length, anything else I have no idea about being new. If anyone has material or a youtube video I can also watch to explain this kind of stuff I would be more than happy to look at it!

    UPDATE 09/10/2017
    Bought Anderson Manufacturing Stripped Lower With Kit from Northwest Armory, $100 Total 21616696_1782996108420038_3993012_o.jpg

    UPDATE 09/15/2017
    Bought Anderson Manufacturing Buffer Tube and Magpul ACS-L Stock, Both Mil-Spec. Along with a Magpul MOE+ Grip. $145 Total
    20170915_195232.jpg
     
    Last edited: Sep 15, 2017 at 8:01 PM
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  2. Diamondback

    Diamondback
    Crapper Gunsmith
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    Usually the "gold standard" most people talk about for long-range Serious Social Work is the Mk 12 SPR, so you might look to it for inspiration--a mil-spec build is good for 600.
    Mk 12 Special Purpose Rifle - Wikipedia

    Both of my builds have been more CQB/"cul-de-sac distance," so that's about all the help I can offer.
     
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  3. USMC-03

    USMC-03
    Moscow on the Willamette (i.e. Portland, Oregon)
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    This is a concept I've been developing for myself over a period of time; an AR15 with two uppers. One 16" carbine for 300 yards and closer paired with a 20" rifle for 200 yards and out. Based on my experience with shooting my current Bushmaster DCM in matches out to 600 yards, I'm confident a property set up rifle with appropriate ammo can consistently reach 800 yards with little trouble.

    The upper will be full A3 flattop with no backup sights, have a 20" full heavy barrel with either 1-8" or 1-7" twist rate, preferred 5 lands/grooves, free float tube/hand guard, 20 MOA kant mount and I have a Leupold 6x mil-dot target scope to mount.

    Ammo would be a 77 grain BTHP loaded magazine length; zero at 600 so it's easy adjustable up and down to practical firing ranges.

    Keep it quality and simple.
     
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  4. No_Regerts

    No_Regerts
    Warshington
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    In my opinion, one of the biggest barriers is the magazine. I like to use longer/heavier, higher BC bullets in my bolt gun. Its a 22 inch, 8 twist barrel with plenty of magazine space to allow me to load bullets closer to the lands. I have had no issues getting to 600 yards with it.

    In an AR with a shorter barrel, Id suggest a 7 or 8 twist. The wylde chamber is getting pretty popular and Ive seen guns using it shoot very well. I'd prefer an 18 or 20 inch barrel if I was going to shoot mostly LR with it. A free floating handguard and bipod would be no-brainer accessories.

    Are you intending to reload?
     
  5. h4344

    h4344
    Portland, OR
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    I dont intend to reload. Just purchase ammo.
     
  6. slimer13

    slimer13
    Deer Park
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    What's been said. Long heavy bullet, long heavy barrel, ff handguard. All I can add is obviously an appropriate optic and ditch the milspec trigger.
     
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  7. Cosmic Osmo

    Cosmic Osmo
    PDX
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    I shoot up to 600 yards off a sling in highpower matches from time to time, and I do... ehh, alright. Here's what you should be looking for, in my opinion.

    Requirements:

    - Wylde chamber
    - 1:8 – 1:7 twist rate
    - Respectable barrel manufacturer
    - Free floated
    - 69gr or heavier bullets, SMK or similar
    - Not using handguard-mounted sights
    - A proper loop sling, or a bipod or other front rest
    - A trigger that isn't terrible

    Recommendations:

    - At least 16" barrel length, but the more the merrier
    - At least a "medium" weight barrel profile
    - At least a 4x magnification optic
    - A 2-stage trigger (eg. Geissele SSA-E)
     
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  8. MountainBear

    MountainBear
    Sweet Home, OR
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    Quality ammo and plenty of trigger time/practice. Good luck with the build.
     
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  9. bsa1917hunter

    bsa1917hunter
    T.D
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    Should be a good thread with lots of input. I have 3 AR's that I'd consider 500 yard shooters. All having a minimum of 20" medium-heavy wt. barrels. One has a 24" tube and Sports a new 4-16x50 Trijicon scope. I'd trust these 3 at that range:

    PSLc4y9.jpg

    Keep us posted on your build progress. Thanks!!!
     
  10. h4344

    h4344
    Portland, OR
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    So much info to read over!!! <3

    By heavy barrel I assume you guys literally mean a heavier barrel? Need to research the 2 stage trigger as I know little to nothing about triggers.
    I had not thought of ammo differences before aside from weight! Ill be sure to remember those! Would a side charging upper make a difference in performance so long as its made by a quality manufacturer?

    So far im looking at

    20" "Heavy" Barrel 1/7 Twist
    Quad Rail free float hand guard for bipod
    Chamber in 556 using 69g bullets or heavier
     
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  11. h4344

    h4344
    Portland, OR
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    Smexy. What stock is that on top? Ill keep you all up to date! Gonna be built over the course of about 2 months.
     
  12. bsa1917hunter

    bsa1917hunter
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    I think Cosmic Osmo hit on some really good points. Those being proper barrel twist rate, ammo and trigger. I'm a huge fan of the Geissele SSA-E trigger, as well as the RRA triggers like the National Match and 2 stage varmint match trigger. I'm a huge fan of the magpul PRS stock (see pic above). They are fully adjustable and comfortable. I also like the rifle length gas system and longer barrel because the rifles soak up more recoil and are a pleasure to shoot. I've found the grip (and grip angle) also makes a big difference in controlling the rifle. My preference goes to the magpul K2+ because it's very comfortable and easy to shoot off the bench or off bags. As far as scopes go, get one that looks good to your eye and most importantly one that tracks well. If I were building a long bomber on a budget, I'd be looking at the SWFA super sniper fixed power scopes. They track awesome, the glass is adequate and they are very rugged scopes for the money...
     
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  13. bsa1917hunter

    bsa1917hunter
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    If you like that stock on the top, you are in luck. It is the newest Magpul PRS (3rd gen stock). It is an awesome stock and has some added features that the first and second gen stocks didn't have. It comes with 2 adapters for either a carbine length buffer tube or rifle length buffer tube. The ergo's on this stock are a little different than the older PRS stocks. It has a longer LOP (thicker pad and more adjustment for LOP) and has a better/thicker recoil pad. I prefer the looks of the older PRS better, but appreciate the newer GEN III for it's ergo's and better versatility. It's hard to go wrong with the newer stock...
     
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  14. bbbass

    bbbass
    La Grande
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    Serious rifle dedicated to long range shooting or sniping only and not too much for lesser yardages of self defense:

    24" heavy barrel, spiral fluted to reduce harmonics
    The best light pull, smooth pull, crisp break, trigger you can afford
    rifle length gas system
    free float handguard
    1/7 or 1/8
    .223 or .223 Wylde (inherently more accurate)
    synthetic lube instead of heavy oil or grease
    good rest to shoot from

    Good luck with the factory ammo, esp in 5.56. I highly recommend reloading because you can test loads until you get the results you want. Factory ammo... maybe your rifle won't like any at all.

    My 18.5" rifle shoots .223 handload 5 shot dime sized groups at 100 yds with handloads that I tuned in for it. Same rifle shoots 2" (.223) and 3.5" (5.56) groups with factory ammo.

    I shoot 55gr bullets so your results may differ. :)
     
  15. Goosebrown

    Goosebrown
    Beaverton
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    What sort of long range shooting? If it's high power or bench rest most of the time you have to load single shot. If you're doing tactical you get a loaded magazine. That makes a difference. If you load single shot you can use really high BC bullets like 75vmax or 90gr VLD target which performs like a 105gr 6mm VLD (that is to say excellent)

    If you aren't going to reload you are just plinking really. Try federal premium Gold Medal 77gr or federal gold medal Berger 73gr. Norma match 77gr sierra match king. Look on midway for hollow point boat tail bullets on the 223 ammo page.

    Absolutely get a 223 Wylde chamber. There is no reason WHAT SO EVER to get either 223 or 5.56.

    1/7 or 1/8 twist

    20" bbl is fine. 24 is better.

    Skip the quad rail. Useless in target shooting. Get keymod or straight tube. Both are easier to hold in a proper standing shooting position. Quad rail is too big around and my hands are huge. You can mount a hand stop or bipod on any handguard. You don't need a laser site, tactical light, backup CQB scope, canopener, drink fridge or whatever else you think you might fit to all those rails you'd be carrying around.

    Side charger is nice but I'd go for a BAD Lever to just move the bolt release to the right hand side.

    Of course you didn't say you want to do competition. So my advice maybe a little over-the-top.

    Whatever you get, enjoy yourself. Heavier bullets. Longer barrels. Higher power scope if you're using a rest or bipod.

    Seriously stay away from the quad rail. Try rifles that have keymod or just straight tube's and they're a lot more comfortable to shoot.
     
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  16. Goosebrown

    Goosebrown
    Beaverton
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    Oh. And get a good trigger.

    I have two match triggers on two Lowers. A timney and a geissle. Both are great. The timney is single stage and I like that better. Timney ar15 competition single stage trigger. That's what I have. 3lb trigger (too light to hunt IMO) like breaking glass. No long hard grindy pull there.

    Figure $250-$300 for trigger. This is the most important investment in your rifle for accuracy you can possibly make.

    I know it sounds like a lot but you really really really want A good trigger.
     
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  17. slimer13

    slimer13
    Deer Park
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    The Larue MBT and the RRA 2 stage are great for around $100.
     
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  18. SKrueger

    SKrueger
    SW Washington
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    Maybe @Kruejl can chime in here. If I am not mistaken he was hitting at 800 and 1000 yds with his AR.
     
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  19. RingingEars

    RingingEars
    Idaho
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    This gets it done to 200m with that 3x red dot.
    20170805_170112.jpg

    Here it is with a Vortex Diamondback HP that would get you to 500m plus easy.
    20160629_175426.jpg

    This is chambered in .223 Wylde.
     
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  20. Kruejl

    Kruejl
    Hillsboro
    Moderator of the Coriolis effect Staff Member Gold Supporter

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    Yes, I was hitting 800 yards with 75 grain Hornady Match ammo out of an 18" 1/7 twist barrel.
     
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