AR builders, come on in....

Discussion in 'Politics | Firearms | Religion' started by Strokerswild, Jan 25, 2019.

  1. Strokerswild

    Strokerswild Shallow and Pedantic

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    So I’ve got one more spot for a long gun in my gun safe, and I’m thinking about building an AR before the Powers That Be either eliminate their existence or hobble them altogether…

    I’ll preface with the fact I’ve got a penchant for the unusual weapon, not to mention I tend to like having multiple guns that utilize the same ammunition. My trusty hunting rifle is a Ruger M77, chambered for .243Win, which has proven itself time and time again hunting mule deer in Montana. Therefore, I’m thinking about putting together a .243 AR10, with the majority of the intended usage being target shooting since I no longer hunt like I once did.

    I’ve read a bit on the topic on various forums, and the general consensus is that such a beast likes a longer barrel (as I would imagine, 20” being the minimum). Of course, the first thing that pops up is why not just go to a .308? Meh, too common, not to mention titles have been won with .243 ARs. And the .308 flies in the face of my unusual gun and common ammo fetishes. Too easy also.

    I’m considering Aero Precision for the lower, but haven’t narrowed down the rest of the parts yet beyond a ton of website bookmarks. The million dollar question is: has anyone here built such an animal? A few friends have the usual .223s and my brother has a nice .308, but I’m always down for something different and looking for first-hand experience.
     
  2. Docscurlock

    Docscurlock Well-Known Member

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    The cool thing about the AR platform is all it takes is another upper to have a completely different gun. Look at the 6.5 calibers for flat and accurate. 6.5 creedmore, 6.5 Grendel etc
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    Yeah, pondered the 6.5 variants too, but they violate the multi-gun, same-ammo mandate....

    The modularity is huge. So many options can be a bad thing for the pocketbook. :wink:
     
  4. Docscurlock

    Docscurlock Well-Known Member

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    That's the magic with the AR, you can remain faithful to your significant other and still date some super models. All it takes is another upper.
     
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  5. Grimace427

    Grimace427 Well-Known Member

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    .308 and .243 share the same case head, correct? Sounds like you can build a .308 upper with a .243 barrel and be good to go. Experiment with buffer weights and definitely get an adjustable gas block..
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    Yes, a .243 is basically a necked down .308 cartridge. That case size dictates going to an AR10.
     
  7. Ninjavitis

    Ninjavitis Member

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    I would recommend building literally everything yourself lower wise and then find the right upper for your mandate. The build is very enjoyable especially if you like working on cars, basically the same thing but you can do it in winter. We did a very basic 300 blackout and it was a lot of fun but in retrospect having a goal before hand i think it would have ended up better. Also, don't forget one of these or equivalent https://www.midwayusa.com/product/1003341857/dpms-accurizing-wedge-ar-15 It is a very simple piece that improves EVERYTHING at the end of your build. Then just buy uppers for whatever you plan to do next.
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    FYI, in a nutshell, the only thing that differs between a .243 and .308 AR is the barrel due to both cartridges having the same parent case with generally similar dimensions (outside of bullet diameter, of course). All else would be shared across the two calibers, had some good talks with a couple of parts manufacturers.

    Found a nice 22" .243 barrel, going to gather the parts to build a nice, long distance tack driver. :like:
     
  9. Grimace427

    Grimace427 Well-Known Member

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    Different bullet masses will necessitate different buffers and/or different gas systems. Highly recommend an adjustable gas block.
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    Correct, on the list.
     
  11. Grintch

    Grintch Well-Known Member

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    Didn't PSA just announce a .243 AR10 at the Shot Show?

    My biggest fear with an oddball caliber ARs is proper feeding with OTS magazines and maintaining capacity. A lot of the designed for AR calibers either require special magazines, or only work with 5-10 rounds in standard (20/30 rd) ones.
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    I hadn't heard that PSA announced that, although it wouldn't surprise me. Remington and Ruger have built them for a while (I don't think the take rate is high), and once somebody starts building AR parts for some oddball round it seems like many others jump on the wagon.

    .243 rounds fit .308 mags perfectly (I have no need for anything more than 10 rounders), it will be interesting to see how it works out. Others have done it with success though.

    Impatiently waiting for Aero's lowers to be back in stock....
     
  13. Grintch

    Grintch Well-Known Member

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    Remember that 7.62x39, 6.8 SPC, 6.5 Grendel, & 300 BLK all were supposed to work with standard mags. Yet they all now have dedicated mags made for them. Because they only worked so-so with standard mags, mostly when only a handful of rounds were loaded.
     
  14. ParsonsWV

    ParsonsWV Member

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    If you are not set on aero precision there are some other companies to look at. Black rain, seekins, etc. Seekins in my go to. I like their quality and their lowers have a slightly unique look as well as being billet.
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    Too late, I've got most of the major parts in hand, minus the lower which appears to be stuck on a truck somewhere in the latest blizzard. :like: Seekins makes some really nice stuff though too.

    My only real hurdle is an adjustable gas block that will fit inside my Aero hand guard. It's looking like my only option might be a JP Rifles unit. Or put on a shorter hand guard that doesn't hide everything....
     
  16. ParsonsWV

    ParsonsWV Member

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    JP makes really nice stuff. Not sure of the diameter of your hand guard but noveske also makes one and their quality is up there with JP.
     
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  17. TomCat0197

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    Strokerswild, I built a 260 Remington on an Aero receiver set. An SLR Rifleworks adjustable gas block fits under the m5E1 handguard, and is click adjustable using a hex wrench.

    Armorally.com has your lower in stock for 133.20. I've purchased from them in the past and they are GTG.
     
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    Strokerswild

    Strokerswild Shallow and Pedantic

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    Thanks for the tip on the SLR gas blocks, looks like nice stuff. All I'm waiting for now is my Aero handguard.

    However, I did a headspace check on my barrel and I'm closing on a no-go gauge. Not good. Lots of conflicting info out there on whether headspace is super critical on an AR, but I'm an anal engineer so it seems like a good idea. But it makes me wonder if complete, off-the-shelf guns from most manufacturers would check out....
     
  19. Docscurlock

    Docscurlock Well-Known Member

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    While on the subject of building ARs, anyone else go all the way with an 80% lower thru the rest of the build?
     
  20. Grimace427

    Grimace427 Well-Known Member

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    Polymer or AL? Given how cheap AR lowers are I think I'd go that route every time over a polymer 80% lower. I picked up a Spikes Punisher lower for $99 at a local gunshow.
     
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