First AR build

Discussion in 'AR-15 Discussion' started by 11B3OJ3, Feb 25, 2013.

  1. 11B3OJ3

    11B3OJ3 New Member

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    Hello all, I'm a US Army infantryman currently stationed in Ga. I'm about to embark on my first AR building journey and obviousley have many questions. A friend of mine bought a number of stripped lower recievers from PSA and the price was right so I jumped on one. It arrived today. Its something I have wanted to do for some time now, but do to deployments, moving duty stations, and starting a family have not gad the means until recently. I am very familier with the M-4/M-16 series rifles so I have a decent level of knowledge as far as gun-theory and operation/maintenance but as I stated, have never built one from the ground up. What I am looking for is advice on building a decent rifle at a moderate price. Nothing fancy, just a 16 inch flat top. I'm also interested to hear about peoples mistakes and common first timer pit falls. I don't know what I don't know, so I can't ask a lot of specific questions. Thank you all for any advice you can give a grunt and first time builder.
     
  2. GeneralPatton

    GeneralPatton New Member

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    Read the sticky's at the top of the forum. They will educate you in many different avenues. There are also several guys here who are quite knowledgeable on the topic, and a few that aren't. I'd imagine your familiarity with the M4 would make this a rather simple task for you, given the main difference will be the FCG.
     

  3. Quentin

    Quentin New Member

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    Hello and welcome, 11B! And thank you for your service.

    You made an excellent choice in the PSA stripped lower and I'd recommend buying PSA's LBK (lower build kit) which for around $100 or so will allow you to complete the lower in an M4 configuration. The lower will be milspec instead of comspec like some kits.

    I'd watch for a PSA barreled upper receiver/URG and would recommend a 16" LW midlength gas system not the 16" M4 profile barrel/carbine length gas. You will still need a BCG and charging handle. PSA sells them but as anywhere finding them in stock can be a problem. Same goes for the URG.

    BCM has a great BCG and CH when in stock, I used theirs in my PSA upper configured as described above.
     
  4. 11B3OJ3

    11B3OJ3 New Member

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    Thanks for the input, that was actually a question I have been wondering about, what is the differences other than just the length of the gas systems in the mid and carbine legnths? Also, I had been looking at buying a upper reciever group as a whole, but am having a moral dilema because wouldnt that take away from the whole DIY aspect of the build? It would make things simpler overall tho. And I'm guessing from your post that PSA makes all around good parts, and I should stick with them for the most part when buying my various components?
     
  5. AgentTikki

    AgentTikki New Member

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    PSA usually has all the right specs. Building an upper requires more specialized tools, if you are willing to take the time and money to invest I'd recommend it.

    Installation of the gas block can be tricky, but not too bad. You may have to remove and install it more than once your first time out so don't go putting loctite on it the first time.

    You will need a barrel wrench, action block, vise, torque wrench etc etc. If you are looking to make more than one, the investment is a no brainer.

    In today's climate, you will be able to save you self a good deal of money if you build it from scratch.





    read this and tell us what you want or need!
    http://www.firearmstalk.com/forums/f20/ar15-primer-beginners-guide-59600/
     
  6. 11B3OJ3

    11B3OJ3 New Member

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    Thank you. That is a huge amount of info to take in. It answered a lot of questions of mine. Anyone know where to get a LPK or buffer tube assembly type kit? I keep seeing them on the deals deals deals thread but theyre always gone by the time I get there
     
  7. AgentTikki

    AgentTikki New Member

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    sign up for email notifications from Palmetto State Armory, Joe Bob Outfitters, Primary Arms and that should pretty much cover everything you new.
     
  8. brettc

    brettc New Member

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    PSA has there lower build kit in stock with buffer assembly and stock
     
  9. 11B3OJ3

    11B3OJ3 New Member

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    Thanks for the heads up. I had been checking them and some other sites but kept coming up empty. I'm so pumped to put together this lower now! I was able to get one of the lower build kits you mentioned from PSA ordered today. Hopefully it ships soon and all the parts are correct.
     
  10. 11B3OJ3

    11B3OJ3 New Member

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    Thanks for the advice and input everyone
     

    Attached Files:

  11. bluez

    bluez Well-Known Member

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    Welcome to the site!
    Like Quentin said read the sticky on AR's. especially the gas system section.
    Since we use 16 inch barrels in the civilian world a military lenght carbine gas system will be overgassed.,
    16 inch barrell and carbione gas system still works fine and relaibe nearly all of the time.

    But the mid lenght gas system is the more proper choice and since u are building form scratch you control all parts so might as well go w/ that.
    More in the stickies.

    : )
     
  12. Quentin

    Quentin New Member

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    Glad you got the LBK from PSA so quick, 11B, nice to get the lower done (and done right with quality parts)!

    Back to building the upper receiver group yourself or buying the URG, I'd go the latter unless you're determined to do all the assembly yourself. Really that doesn't matter, what matters is choosing the right components that go into the URG and I've always been able to find exactly what I want from PSA, BCM and Daniel Defense. I was able to find URGs factory built to my exact specs so why bother to assemble the upper myself. Up to you of course.

    Myself, I prefer a 16" pencil barreled midlength upper. Chrome lined barrel, 1:7" twist. Full auto/M16 BCG from BCM, DD, PSA or other milspec unit.
     
    Last edited: Mar 8, 2013
  13. 11B3OJ3

    11B3OJ3 New Member

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    What is the benefit of a full auto/M16 BCG on a semi auto AR15?
     
  14. Gatoragn

    Gatoragn Active Member

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    If the BCG can handle full auto, it should be nearly indestructible in a semi-automatic.
     
  15. bluez

    bluez Well-Known Member

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    There is also a disadvantage.
    extra weight.
    BCGs generally dont break anyway.

    And adding a full auto BCG to a rifle that already has heavy buffer may be the straw that gets it to experience cycling problems with weaker ammo such as many 223 rounds. :)
     
  16. Quentin

    Quentin New Member

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    The main reason is the M16 BCGs tend to be truly milspec which often isn't true of the AR-15 or modified AR-15 versions. You might as well get one that's built right. Here's what BCM says about their BCG. Try to get that kind of information out of the comspec AR makers.


    BCM Bolt Carrier Group Features

    •Milspec Carpenter No. 158® steel
    •HPT Bolt (High Pressure Tested/ Proof)
    •MPI Bolt (Magnetic Particle Inspected)
    •Shot Peened Bolt
    •Chrome Lined Carrier (M16/AUTO)
    •Chrome Lined Gas Key
    •Gas Key Hardened to USGI Specifications
    •Grade 8 Hardened Fasteners
    •Key Staked Per Mil-Spec
    •Tool Steel Extractor
    •BCM Extractor Spring
    •Black Extractor Insert
    •Mil-Spec Crane O-Ring (optional)

    http://www.bravocompanyusa.com/BCM-...Auto-M16-p/bcm bolt carrier group auto mp.htm
     
  17. Squawk

    Squawk New Member

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    I would also consider looking for anything made by Spikes Tactical. I got a complete upper w/ BCG and CH for $525 in January. Very satisfied.
     
  18. 11B3OJ3

    11B3OJ3 New Member

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    I saw some spikes uppers on AIM for around $520 that look really good for the price, but theyre always sold out of them