Upper build help

Discussion in 'AR-15 Discussion' started by GonzoLonzo, Sep 14, 2012.

  1. GonzoLonzo

    GonzoLonzo New Member

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    Hey guys, I am going to build an upper for my AR. Now this will be my first upper build so I will be asking for a lot of help in the meantime:D.

    First the upper I am looking at is the PSA upper.
    http://palmettostatearmory.com/inde.../upper-receivers/complete-upper-receiver.html

    The barrel I was looking at is the Spike's 16" cold hammer forged mid length gas, and its chrome lined. It's also MP and HP tested.
    http://www.brownells.com/.aspx/pid=45463/Product/AR-15-M16-FN-COLD-HAMMER-FORGED-BARRELS

    If you guys have any recomendations or suggestions or something else I should look at, please let me know. I will ask for suggestions on the other parts later.
     
  2. AgentTikki

    AgentTikki New Member

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    My personal experience with Spike's barrels is that they make the gas port too large. Good if all you plan to shoot is weak underpowered ammo but it definately overgasses the system. Id look elsewhere.
     

  3. GonzoLonzo

    GonzoLonzo New Member

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    Hey Tikki, which barrel would you recommend? I've been looking at some but I didn't know about that. Now I know, thanks.
     
  4. rugerry

    rugerry New Member

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    Can the over gasing be counteracted by a heavier buffer?
     
  5. Jpyle

    Jpyle New Member

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    Generally, yes but it can be an expensive trial and error process. Best to go with another brand if its a known issue.
     
  6. AgentTikki

    AgentTikki New Member

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    Oversizing the gas port has one advantage. It will cycle weak underpowered ammo. Since all the local ranges by me don't allow the use of steel core, I never get to shoot the cheap stuff, ie wolf tula herter's etc. So no real benefit for me. Ymmv.

    Now, once th port is oversized there's nogoing back unless you get an adjustable gas block. It creates more force driving he bcg. More force means more wear and tear on the internals. Thing concievably break earlier. You can bandaid it by using a heavier buffer and spring rates. But this changes the timing of your gas system and slows down your follow up shots, and keep in mind the same force is still applied, so it doesn't change the fact that your parts will wear faster. Ever think way Spikes ships all their uppers and rifles with their st-t2 heavy buffers? Well its kuz they over gas their systems.....
     
  7. JonM

    JonM Moderator

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    Bcm supplies good milspec type barrels i highly suspect they source them from FN. Rra mainly uses wilson barrels great for accuracy builds. Or if your going precision order a custom barrel from someone like krieger or white oak
     
  8. rugerry

    rugerry New Member

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    Does anyone use an adjustable gas block? What are some pros and cons? What should be looked and when looking for one?
     
  9. AgentTikki

    AgentTikki New Member

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    More moving parts making it inherently more unreliable. I'm considering one for range/precision build. Being able to tune your gas system sounds like fun, but potentially a big headache >.<
     
  10. Gatoragn

    Gatoragn Active Member

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    I ordered a CL, CHF, barrel from PSA to use with my PSA stripped upper, PSA stripped lower and PSA lower parts kit. I ordered the BCG from Bravo Co.

    I believe PSA sources their barrels from FN, also.
     
  11. AgentTikki

    AgentTikki New Member

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    PSA sells a good barrel their chrome lined cmv and cold hammer forged barrels are made by Fabrique Nacionale "FN", a military contractor. Good price too. Hp mp tested too.

    Daniel defence. BCM. Are always a good choice.

    I've heard RRA makes a good barrel too. No personal experience tho. Ar15performance makes a good melonited barrel for a great price too.
     
  12. GonzoLonzo

    GonzoLonzo New Member

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    Hey guys, thanks for the info so far. This build is mainly going to be a SHTF/range gun. I already have a 20" SS varmint gun so I am not going to need a custom barrel. It would be nice though.

    So if BCM and PSA both get their barrels from FN, then I should be able to get the one thats less expensive and still be good to go, yes? Also, I saw a Daneils Defense barrel with a 1 in 9" twist. I thought they were all 1 in 7". Since all the ammo I have or that I generally see in stores in 55 or 62 gr. will the 1 in 9" give me more accuracy? Or should I just go with the 1 in 7"?
     
  13. AgentTikki

    AgentTikki New Member

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    55gr will do better in a 1x9
    62 steel core better in a 1x7

    either will do fine in either for practical shooting.
     
  14. Gatoragn

    Gatoragn Active Member

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    I shoot 55 grain .223 in my 1:7 twist quite often, it won't win any national matches, but it prints pretty good at 100 yards.
     
  15. GonzoLonzo

    GonzoLonzo New Member

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    I have decided to go with the PSA cold hammer forged 16" barrel. So now I need to know what tools I am going to need to get the job done. I have the punch set and other common tools. I am getting the armorers tool and the upper vise block. Are there any other specialty tools that I might need?
     
  16. Gatoragn

    Gatoragn Active Member

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    You will need a 0.5 inch torque wrench, but you can pick one up at Sears, auto parts store, Lowes, etc.

    The Brownells essential AR15 kit is what I purchased, it has some doo dads that make assembling an AR lower a snap.

    http://www.brownells.com/.aspx/pid=41214/Product/AR-15-M16-CRITICAL-TOOLS-KIT