Light Strikes on brand new AR in 1st Mag

Discussion in 'AR-15 Discussion' started by bluez, Jan 12, 2014.

  1. bluez

    bluez Well-Known Member

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    I just bought a very very nice AR15 all ultra hi end parts.

    It was supposed to be a demo piece for a shop but someone blemished the Vltor-Mur Upper on the thing the forward assist sits in and so they couldnt use it as a demo.

    Got a screaming deal as a result on a AR that otherwise would have been unaffordable to me.

    The lower is a Seekins Precision 223 SP223.

    The rifle was unfired

    During the first magazine I got multiple failure to fire.
    First 3 rounds went w/o a hitch.
    Then the next 10 attempted shots were failure to fire.

    I checked if the bolt was fully in battery and that stuff since as a new gun I thought at first, maybe it was short cycling , but it wasnt...... as most rounds simply had a light strike indentation.

    near the end of the 1st mag the gun started working a little.
    And during the 2nd mag it took off and worked perfect.

    I followed it up with another 3 mags w/o any problems (20 rds per 30 rd mag)

    I had not brought any more ammo than that, as I wanted to focus on zero and then maybe a little break in.

    Rifle got a basic clean/lube by me before I took it to the range.

    When I got the weak hammer strikes , at first I thought maybe they had a softer trigger spring kit in there and its too light for my ammo (Federal 5.56 mm M193F)...?

    But then the problem suddenly stopped occuring....
    The bolt and BCG are Black Rain Nickel Boron..BTW, not sure it matters.

    Weird. any thoughts?:confused:
     
    Last edited: Jan 12, 2014
  2. csaw44

    csaw44 New Member

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    Just needed a little break in time? Give it a good cleaning and shoot some more . I would shoot a few hundred rounds without cleaning to determine it I would be able to depend on proper functioning. Also,Protrusion of the FP out the bolt face with it bottomed out against the back side of the bolt should be .032 to .037
     
    Last edited: Jan 12, 2014

  3. SSGN_Doc

    SSGN_Doc Well-Known Member

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    Possibly too much oil in the firing pin channel?
     
  4. bluez

    bluez Well-Known Member

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    Csaw and Doc:


    That would explain the symptoms because the oil would be blown out after a while.
    I dont think I oiled it real heavy tho (albeit heavier than many others do)
    Something in the firing pin channel is what I was thinking.

    I successfully Zeroed my Irons and once i have a Optic on it will zero that was well.
    During my next zero process I will get more data points if it was just a blocked channel or break in issue or something else.

    Thanks fellas!
     
  5. TexasGunner

    TexasGunner New Member

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    Let's see some pics of that bad boy! I love the SP223 lower. My latest build is built on one.
     
  6. Triumphman

    Triumphman Active Member

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    Sounds like it worked it self out of it's own problem. I was gonna suggest, that those new parts had to wear themself's in from such tight fit. Use good Oil, and have at it.
     
  7. Sniper03

    Sniper03 Supporting Member Supporter

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    Bluez,

    One thing you might not be aware of is that any round that has been chambered in an AR Rifle will and should have a slight indentation in the primer of the round chambered. That is perfectly normal. Also there should not be any break in period on an AR Rifle. They should work out of the box if lubricated properly. Also grease should not be used on them. Only a good quality lubricant like Breakfree, G-96 or other good lube. Rem Oil is not recommended for the AR Rifle. It is great lube for the right weapon or fishing reel but will cook off if the rifle gets hot during shooting a lot of rounds. My main thought was what ammunition are you using? Are the reloads? Also when this occurs is the hammer in the fired position or cocked back? Give us some more details if you can. The Bolt Carrier Group should just look damp. When I put a little lube on the firing pin while cleaning I wipe the lube on and then take a dry patch and wipe off all excess so there is no visible lube on it. Ammunition as previously stated would be my first suspicion on your issue since you advised the bolt is going completely into battery. Try some good quality ammunition like Federal, American Eagle, Winchester, Black Hills for example. Let us know about the hammer position!

    03
     
  8. JonM

    JonM Moderator

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    What are you using for a trigger pack??

    Some folks especially gunshop "experts" will clip or bend the hammer springs trying to get a lighter trigger pull. Leads to light strikes.
     
  9. okdonk

    okdonk New Member

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    Try using stock Fire Control group and try out heavier buffer like H2.
     
  10. bluez

    bluez Well-Known Member

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    Thanks for all the input guys!

    Let me answer you guys in order of comments:

    -Texas: will do :)
    - Triumph, That is kinda my hope
    - Sniper: You'r right I totally forgot about the chambering indent! I did use Hoppes Gun Oil.. I also have EWL and others but i wanted to use up my Hoppes first. I did not wipe the pin after oiling.:eek:
    I dont think its the Ammo. I made sure for break in i had full powered Federal 5.56 M193
    -Jon: Thing is I dont know what the trigger pack is.. when I bought the gun on the strenght on its parts and back story ( shops showroom model) .. I dont know if the trigger back is stock, or a lighter JP spring or what...:eek:
    -Okdonk, why heavier? ( it currently has a carbine weight) , why not lighter?


    :)
     
  11. purehavoc

    purehavoc New Member

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    If you need less than a carbine buffer on a 5.56 you have other issues . I thinking maybe your trigger group was installed dry causing enough friction to slow up the hammer and cause light strikes .
     
  12. bluez

    bluez Well-Known Member

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    I lubed it up good today in time for my next outing : )
     
  13. okdonk

    okdonk New Member

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    Maybe it's just me. I always use H2 or Spike's ST2 on all my rifles.
     
  14. JonM

    JonM Moderator

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    Correct lubrication is important even in ak47. Your trigger and hammer springs should have a tiny spot of gun grease on each coil section the firing pin dry to start. Lube especially 30w non detergent motor oil will find its way in there just lubing the carrier.

    I would go ask what trigger setup they used to build the rifle.
     
  15. sweeper22

    sweeper22 New Member

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    I've had this occur before. Some BCGs are shipped out with what appears to be almost packing/storage type grease on the firing pin.
     
  16. bluez

    bluez Well-Known Member

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    I did notice a strong smell of shipping grease....
    I cleaned the pin after my last shooting (but not before).

    I will repeat and also wipe the pin before my next shoot :)
     
  17. Hookeye

    Hookeye Active Member

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    FWIW I have run JP lighter springs in all of mine, but use reg GI hammers/LPK. Never a problem.
     
  18. bamashooter68

    bamashooter68 Member

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    I have been using the same quart of Mobile since I bought my AR. I haven't had any lube related issues yet. I have barely put a dent in that quart of oil. It will last a long time. I took some out and put it in a old army oil bottle for my range bag so I wouldn't have to lug around the quart bottle.
     
  19. SkilletFan24

    SkilletFan24 New Member

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    Have you considered there's something wrong with the hammer spring?
     
  20. bluez

    bluez Well-Known Member

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    I had a suspicon that it might be a light spring kit or something..
    The trigger group certainly looks very nicely made