First Build Here, Am I Missing Anything?

Discussion in 'AR-15 Discussion' started by FightinTexasAggie, Dec 5, 2010.

  1. FightinTexasAggie

    FightinTexasAggie New Member

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    I am finally finishing my first AR build (and first AR) I ran out of funds for a while back. Im pretty sure I have everything ordered that I will need to complete the rifle, and wanted the experts to give me feedback. I decided to go with a complete upper to avoid buying more expensive tools.

    CMMG Stripped Lower Receiver
    Del-Ton Complete Lower Parts Kit
    M4 CAR Buttstock Assembly - With Buffer and Spring
    Yankee Hill Machine - Black Diamond Specter XL Top End

    Do I have everything I will need to complete my AR (not counting tools)?
     
  2. mjkeat

    mjkeat New Member

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    It didnt look like the stock kit came with a buffer plate. Its the plate that goes on the end of the lower and is held in place by the castle nut. It holds the rear take down pin detent spring in place.
     

  3. FightinTexasAggie

    FightinTexasAggie New Member

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    I got the parts in yesterday, and it did come with the plate. I have 2 more questions for now.

    What needs to be oiled/lubricated as I put everything together?
    What do I need to do to function test it before any live rounds see the rifle?
     
  4. Dillinger

    Dillinger New Member

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    For just the lower, or for the complete rifle?

    The lower is going to require very little in the way of grease or oil to start with. A very thin wiping down at the most just to protect against the oils from your hands.

    DO NOT - and I can not say this enough - DO NOT:

    Assemble the lower, cock the hammer and pull the trigger allowing the hammer to slam forward into the front half of the lower receiver! :eek:

    NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER, NEVER Do that. :p
     
  5. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin,

    Since you purchased the complete Upper & Barrel Assembly together you do not need anything but a good weapon lube like G-96, Breakfree (Of course shake it up first). As Dillinger advised just lube the entire weapon with a light coat and wipe the excess off. All of your parts being new have little if any lube on them. Put a drop of oil (Lube on the spring coils of both the Hammer and Trigger. Lube your Bolt Carrier Group well before you start shooting. I like them looking a little wet. Then you can do a few break in shots and enjoy! If you would have put the barrel on the upper then you would have needed to use a High Temp Anti Seize grease on the threads of the receiver before putting the barrel nut in place. One other word of caution. Be sure when you installed the Stock Extension Tube into the lower Receiver that the engagement of the Extension Tube is approximately engaged 1/2 way between the little tip of the Buffer Retainer and the outside edge of the Buffer Retainer. And of course the Castle Nut is tight and will not come loose.
    If not you can actually tear up a receiver if it does not have proper location engagement and the Buffer Retainer starts coming out of the receiver.
    Good luck with the new rifle! Sounds great!

    03
     
  6. FightinTexasAggie

    FightinTexasAggie New Member

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    I took the stock in to a local shop that does a lot of work on ARs instead of buying the tool. It looks like they tightened the buffer tube right against the piece on the retainer, but it is not blocking the retainer from moving at all.

    I'm kind of confused as to how the trigger/hammer/disconnecter work. The trigger will barely move unless the hammer is down. Might be normal, but what pulls the hammer down every time you pull the trigger? The disconnecter also will barely move. I checked a few guides and can't see anything I might have done wrong.
     
  7. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin,

    The closer the extension tube (Stock Tube) is to that tip and still does not inhibit the Buffer Retainer the better it is. Sounds like they did a good job.
    As far as the issue with the Disconector. It may be? That you have the Disconector Spring in upside down. The spring has a larger coil on one end and a smaller coil on the other. The Large Coil goes down into the Trigger recess first and snaps in there so it will not fall out. The small coil is at the top and goes in the window on the Disconector. If you have it upside down the larger coil is at the top and when you push down on the Disconector the large coil hangs on the top edge of the trigger. Check that out and let me know if I can be of any assistance.

    03
     
  8. FightinTexasAggie

    FightinTexasAggie New Member

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    The disconnecter spring is in right. I may have everything right, I'm just not real familiar with how everything is supposed to work. I probably will take it in tomorrow and let the experts go through and check it out just to be safe.
     
  9. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin

    Do you know how to do a function check on it. If it does that correctly you are OK. If you do not I will advise you. What happens is when the trigger is pulled and the weapon is fired, since in theory the rifle is cycling at around 700 rounds a minute as far as mechanics speed. Since it happens so quickly you could not get your finger off of the trigger that fast and the hammer would just follow the Bolt Carrier forward and probably would not fire. The Disconector grabs the hammer lets the hammer spring maintain tension and the Bolt Carrier goes into battery. When the operator lets go and the trigger goes forward the Hammer is transferred to the sear and the front portion of the trigger. If you attempt to do this with your fingers you have a tendency to force down farther which causes over travel and it does not seem to work correctly.
     
  10. mjkeat

    mjkeat New Member

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    Go here and check out the videos just below the top right corner.

    Just checked my factory LWRC and the trigger has play with the hammer forward and with the hammer locked. When locked the hammer will draw in slightly when working the trigger. As long as the hammer doesnt drop with the safety on and it passed a functions check you should be good.
     
    Last edited: Dec 9, 2010
  11. Shihan

    Shihan Active Member Lifetime Supporter

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    You seem to be missing a Bayonet.:D
    [​IMG]
     
  12. FightinTexasAggie

    FightinTexasAggie New Member

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    Ive been looking through instructions trying to pinpoint where I start having problems. It seems like everything works right until I install the hammer. I noticed with the hammer in, it is pressed tight against the bolt catch, tight enough where the bolt catch will not even shut freely as the instructions said it should. With the hammer in, the trigger acts like the safety is on, even when it is set to fire and the selector wont budge. Without the hammer, the trigger moves freely as I would think it should and the selector can easily be switched from safe to fire. From what Ive read, when the hammer is upright and the trigger is pulled, the hammer should move some?
     
  13. mjkeat

    mjkeat New Member

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    Id remove the trigger group and selector then reinstall.
     
  14. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin,

    It is my thought the problem that you are experiencing is not a new one. Most of the time it is caused by tolerances on the rear of the trigger or tolerance with the safety selector. When you install the trigger it forces the front of the trigger down slightly and causes the rear of the trigger to amplify the tolerance problem and locks things up. If you wish give me a call at 1-888-222-0043 and I can explain in detail. Or if you have a friend that has a single stage unit in his or her weapon switch out the trigger and selector and the problem should go away. Obviously it is hard to be positive without having the weapon to inspect and look at. But I truly believe this is your problem and it is a solvable issue as frustrating as it seems.

    03
     
  15. FightinTexasAggie

    FightinTexasAggie New Member

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    I tried removing and reinstalling with no luck. I'm planning on taking it in to get checked out later today, so I guess worst case I'll have to buy a new trigger assembly?

    While I'm there, what do y'all recommend to buy for cleaning? I already picked up some of the G-96 that was recommended.
     
  16. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin,

    At least try another one
    The funny thing about this is that the tolerance I was speaking about only has to very a few thousandths of an inch. It could very well work in another AR we have seen this before. It is the match between the Trigger and the Selector normally. Another thing is you can mark the sides and the to edge of the trigger with tool makers die and see where the strike is. But going the direction you are heading is the best way to handle this. If the new trigger does not do it change out the selector it could have a defective tolerance on one of the machined grooves in it. One thing I did not mention be sure your disconector is straight and with no burrs. But I am betting on the Trigger and or Selector. Good Luck and let me know!
     
  17. FightinTexasAggie

    FightinTexasAggie New Member

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    Sniper, you nailed it. I took it in, and they let me try out a different trigger which worked flawlessly. I didnt buy the parts there, but they were nice enough to swap out the triggers for me at no charge. They said it just didnt match up right with my receiver, but they would still be able to use it.
     
  18. Sniper03

    Sniper03 Supporting Member Supporter

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    Fightin,

    That is good! That is what most of us are on the forum for. To learn ourselves and to help. It is our pleasure when we can assist. I am very glad you found :)it and now the frustration has ended! Have Fun with that new rifle!

    03
     
  19. mjkeat

    mjkeat New Member

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    Glad to hear everything worked out for you.
     
  20. FightinTexasAggie

    FightinTexasAggie New Member

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    I want to thank everyone for all of the help/advice. The rifle shoots great. I have final exams this week, so I only had time to put a few rounds through it. I havent even tried adjusting the sights yet (shoots low and to the left), but after exams are done I will have pics up.