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Finishing up my first AR-15 build

Discussion in 'Rifle Discussion' started by raindog, Dec 20, 2012.

  1. raindog

    raindog Portland, OR Active Member

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    Had the afternoon off so I spent some time putting together my AR-15. Guess I timed buying the parts (October) right...sheesh...

    The gear:
    • lower I got from JC Weaponry - great guy
    • MOE upper (1:7 16" chrome)
    • MOE M4-style stock
    • CMMG 2-stage LPK
    • MOE sights
    • Awaiting arrival of Burris rings and a Bushnell Elite 3200 scope

    I mostly used these guides:
    • ITS Tactical YouTube: DIY AR-15 Build - YouTube Really liked this series, though some of the instructions were specific to the parts they chose. Still, very helpful to see the work as it was done.
    • CMMG LPK video: CMMG Lower Parts Kit HD - YouTube Man someone spent a lot of time doing the video rendering for this. Beautiful vid.
    • BuildYourOwnAR15.com - not that great a guide, really but for $10 it wasn't bad.

    Really, it's not hard to build your own AR-15. A little harder than I thought, though. Major tripping points:
    • Hammering the roll pins in. This wasn't hard just kind of a pain.
    • I didn't have any problems with the spring-loaded detents but only because I read numerous times that they are easy to launch/lose.
    • Screwing in the stock with the takedown detent, buffer spring, etc. was ridiculous...took a while to get that all done.
    • The CMMG 2-part trigger is different than every other guide. Took me a while to realize that the disconnector and spring in the box weren't needed and that the trigger was already assembled. CMMG customer service was very helpful.

    Still have to put on front/back sights, and install the optics. I also don't have a castle nut tool so I ordered one to tighten up the stock.

    Two things disappoint me:
    1. The hammer and trigger pins fall out at the drop of a hat. Seriously! I ordered some of the KNS no-walk but these are ridiculous. Don't know if something is mismade or misinstalled.
    2. The two-stage CMMG trigger is...well, let's just say I have a different idea of two-stage. There are two stages, but it's a light first stage and a very heavy second stage, which really defeats the purpose. I am going to reexamine all of that setup in case perhaps something is not correct but it's not adjustable and it does dry-fire correctly so I don't think I put it together wrong.

    Now I want to build another one :)
     
  2. rds801

    rds801 Portland Member

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    Your pins should be held in by the springs. Pins have the notches on the side and in the middle?
     
    mjbskwim and (deleted member) like this.
  3. mjbskwim

    mjbskwim Salmon,Idaho Well-Known Member

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    Hahah,oh sorry

    Probably what's happened since your pins fall out and you think the trigger sucks.
    get back on line and youtube to see the proper installation.

    Hers a pagefull for ya
    AR trigger install - YouTube
     
  4. raindog

    raindog Portland, OR Active Member

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    Yeah, that first video series is the one I linked to in my original post :)

    The CMMG 2-stage trigger is a bit different than the trigger shown in most AR videos, particularly where the pins go through I'm going to play with it a bit tomorrow. I'm aware that the springs are supposed to go in the grooves but the DIY recipe doesn't fit because the trigger is different.
     
  5. mjbskwim

    mjbskwim Salmon,Idaho Well-Known Member

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    Can't find it on the CMMG sight either?
     
  6. iamme

    iamme Lane County Well-Known Member

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    The trigger installs the same as any other and shouldn't be impacting these parts. SOMETHING is installed wrong. As for the trigger- I would reccomend switching to Geislee triggers next time and not looking back!
     
  7. mjbskwim

    mjbskwim Salmon,Idaho Well-Known Member

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    See I didn't know enough to say this but thunk it.
    I suspected the parts had to install the same but were made to better specs and were polished.
     
  8. HappyRoman

    HappyRoman Sherwood Forest Bronze Supporter Bronze Supporter

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    Look at the placement of trigger group springs as mentioned above. The springs properly installed will hold the pins. they exert enough force.. If you are experencing fallout find a blownup diagram and reset spring placement.. the are works even with lots of errors, remember they had to work in the field when stripped for cleaning, even when put back together wrong.. just my .02c
     
  9. Ligito

    Ligito Oregon Active Member

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  10. TacticalMark

    TacticalMark Seattle Member

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    X2 something is wrong with the install, or something is way out of spec.