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common AR-15 parts to fail?

Discussion in 'Maintenance & Gunsmithing' started by jdub75, Jan 25, 2010.

  1. jdub75

    jdub75 PNW Well-Known Member

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    I am pretty well set on my emergency kits, and now thinking to keep a few of the most common parts on AR-15/M4 variant rifles to break as part of those kits. I'm pretty new to the black rifle, so any help would be appreciated.
    I don't want to keep every part imaginable, just those most commonly broken seen by you smiths, operators, troops, vets, etc.

    Thanks!
     
  2. tallshipsgo

    tallshipsgo Springfield OR Well-Known Member

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    Get an LPK to start with, that'll cover everything for the lower. I'm sure that's just a start as the other folks here know far more than I do. A spare lower parts kit isn't a bad idea though.
     
  3. eldbillbo

    eldbillbo clackamas New world samurai and a redneck none the less Bronze Supporter

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    some manufactures like dpms sell kits to what they consider ware out


    the only parts i have had issues or expect failure off the top of my head are


    cam pin-must have ( i have had one break it was not a mil spec brand )

    gas rings -must have (these ware out)

    extractor assembly -must have

    ejector assembly -must have

    firing pin -should have

    possibly FCG -just for insurance

    buffer detent assembly -should have

    bolt maybe but odds are it will last as long as your barrel but if your
    planning for the shtf then pack one

    you can fit all these into a grip compartment or a2 buttstock

    or get a spare complete rifle then you will have all the spare parts you need.




    every thing else is ware and tear should last life of rifle or unless you break it or abuse it or totally take it apart and springs or detents flying through the air.
     
  4. pencap

    pencap Oregon Member

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    I keep at least 5 of everything on hand at all times
     
  5. jdub75

    jdub75 PNW Well-Known Member

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    5 AR's? :laugh:
     
  6. Beagle

    Beagle Puyallup WA Member

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    all of my ar's have magpul grips with the bolt/firing pin insert in the grip.
    then i still have a little room and i put a extracter and spring plus cam pin all in a plastic bag and stuff those in there to. spare battery goes in the larue mount for my m3. also on my main rifle my noveske n4 it has all the above on and in it then i have a lmt sop mod stock and they have storage spots in them.i put misc. stuff in those two spots. the only thing that i can't keep on the rifle that i really wish i could might be a extra gas tube.:thumbup:
     
  7. Beagle

    Beagle Puyallup WA Member

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    all of my ar's have magpul grips with the bolt/firing pin insert in the grip.
    then i still have a little room and i put a extracter and spring plus cam pin all in a plastic bag and stuff those in there to. spare battery goes in the larue mount for my m3. also on my main rifle my noveske n4 it has all the above on and in it then i have a lmt sop mod stock and they have storage spots in them.i put misc. stuff in those two spots. the only thing that i can't keep on the rifle that i really wish i could might be a extra gas tube.:thumbup:
     
  8. NorthernBornRebel

    NorthernBornRebel Keizer Member

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    I would keep a spare bolt and firing pin at a minimum. Other than that, maybe an extra LPK, but if your lower is assembled correctly, you're going to go through a ton of ammo before something in the lower needs to be replaced (assuming you're starting out with quality parts).
     
  9. jdub75

    jdub75 PNW Well-Known Member

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    THanks for all the tips!
     
  10. madcratebuilder

    madcratebuilder Ardenwald, OR Well-Known Member

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    Some guys carry so many spare parts with them they might as well have a second rifle. Gas rings, ejector and extractor parts are what I carry with me. I keep a LPK and firing pin in the spares box at home, a spare bolt would be nice to have, but now your getting close to a spare rifle.
     
  11. Ramjet57

    Ramjet57 Nw Oregun Member

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    I have read that most bolts start showing cracks at 5000 rds and the buffer tube spring is getting weak at the same point. unless your using a David Tubbs spring there good to 50,000 rds.:cool:
    ymmv
    Ron