Staking

Discussion in 'AR-15 Discussion' started by Ruger52, Nov 9, 2012.

  1. Ruger52

    Ruger52 New Member

    120
    0
    0
    Guys & gals, I have shot the M16/ar platform since 1972. While in the military, I just shot them, cleaned them, and shot some more. So it has been a few years since I have been around the AR platform. So could someone explain staking. I have an idea what it is but I am just not sure.

    I own a DPMS AP4, currently. Don't want to hear negs. about it. It works fine for what I am using it for.

    Thinking of doing a build, if I can find a decent lower, with out breaking the bank, in light of November 6th. So it sound like good staking is important, if I knew what it meant. :confused:
     
  2. mountainman13

    mountainman13 New Member

    11,488
    0
    0
    Pull out your bolt and look at the screws holding the gas key on. See the dents that pin those screws in place? That's staking. If those screws weren't properly staked they would come loose and your AR would not properly cycle. ;)
     

  3. Jpyle

    Jpyle New Member

    4,828
    0
    0
    The triangular indents on the gas key screws are typically what is referred to as staking on an AR. The base plate on a collapsible stock may also be staked to the buffer extension tube.

    [​IMG]

    [​IMG]
     
  4. Ruger52

    Ruger52 New Member

    120
    0
    0
    Thanks so much for the explanation. Makes total sense. In the carpentry business we call it peining. Done to scews or fasteners that you don't want coming loose.
     
  5. mountainman13

    mountainman13 New Member

    11,488
    0
    0
  6. JonM

    JonM Moderator

    20,110
    19
    38
    the reason its very important is that torqued only if they vibrate just a little loose the whole key can shear off under heavy use from the itty bitty bit of wiggle.

    some companies locktite the key. if thats done and the gun is run hard the heat kills the loctite further vibration can loosen the bolts and your at square one.

    staking just nips that bs right in the bud eliminating one source of fail under hard use.

    if the gun is just plinking at the range it really doesnt matter. the heating up and cooling down causes metal expansion and the loosening of screws. just plinking the gun never gets that hot so unstaked key on a typical range only ar15 it really doesnt matter.
     
  7. tacticalfun

    tacticalfun Active Member

    2,243
    0
    36
    Here's a mil spec noveske with a top notch(ha ha) stake job.

    ForumRunner_20121110_212134.jpg
     
  8. Ruger52

    Ruger52 New Member

    120
    0
    0
    Of course I pulled my BCG out and sure enough it is staked. Thanks again.
     
  9. Ruger52

    Ruger52 New Member

    120
    0
    0
    Well I got to bump this, not because I have a big head, but maybe a fat head though.

    I am gonna install a new end plate with a sling ring. I'll be ding dog daggety, if the castle nut isn't staked. Can I get it off without messing up the threads on the tube?
     
  10. Sniper03

    Sniper03 Supporting Member Supporter

    7,719
    201
    63
    Ruger,

    JP and Fun have shown you good examples of staking. The staking is performed on the very top edge of the carrier key next to the screws. If you do not have a staking tool you can use a 3/32 flat nosed punch like a Sterret 3/32 punch. But what ever you do stay off of the lower ledge because it is a glide surface in the upper receiver. Should you get a slight burr on that surface when staking take a stone or a fine file and clean off the burr. Do not use loctite on the Carrier Key or Screws. The military uses a red looking sealer that some have mistaken for loctite under the carrier key but it is not. The sealer in reality is not necessary only a military specification on some rifle contracts. There is also an easier way of staking also. That is take a small center punch and stake the metal of the carrier key in a triangular patter on the edge of the carrier key next to the screw which will flow the metal of the key into the vertical serrations on the side of the screw therefor locking the screw in place. I hope the example comes through?
    This is an easy way of staking with little chance of hitting the glide surface when not using a staking tool.
    03
     
  11. Sniper03

    Sniper03 Supporting Member Supporter

    7,719
    201
    63
    Let me try to download the drawing one more time. If it does not work it is because I am trying to download Microsoft Publisher to the FTF. I am trying a JPeg on this one. We will see if it works?

    03
     

    Attached Files:

  12. gunsmoke11

    gunsmoke11 New Member

    812
    2
    0
    Around 10 years ago I fired my Colt New Service. I never experienced 2 rounds going off in a revolver when only pulling the trigger once. What happened was the recoil plate(donut) had fallen out without my knowledge and I didn't notice it when I swung open the cylinder to load.

    Apparently when that recoil plate is missing the gas blowing back when the primer ignites has enough force to send the hammer back again and then the hammer fell forward discharging the next round. At this time the firing pin embedded itself into the primer and it had to be freed in order to open the cylinder again. This scared the crap out of me.

    I happened to have a recoil plate from a SAA that was slightly larger that had to be fitted. That little donut also had to be staked to prevent it from happening again. But other than that incident my 90 year old Colt never gave me a problem.
    [​IMG]
    [​IMG]
    [​IMG]
     
  13. X-5

    X-5 New Member

    37
    0
    0

    Since you said you own a DPMS, odds are it is NOT staked adequately.
     
  14. Brettad789

    Brettad789 New Member

    34
    0
    0
    I had the same problem with my rifle. I just used a dremel and cut it off. Just make sure that you don't go all the way through so that you don't damage the buffer tube and then use an ar tool to break it the rest of the way. You will need to buy a new castle nut of course but they're cheap. Took me less then 5 minutes to do the whole thing so it's pretty easy.
     
  15. Quentin

    Quentin New Member

    7,551
    1
    0
    You can reuse the castle nut if it's not damaged. You don't stake the CN, it's the end plate that's staked and of course Ruger said he's replacing it.
     
  16. Brettad789

    Brettad789 New Member

    34
    0
    0
    Well when I did it the nut got cut in the process. Wasn't bad enough that it couldn't have been reused but looked bad enough that buying a less than $5 nut was a better choice.
     
  17. Quentin

    Quentin New Member

    7,551
    1
    0
    Still, it doesn't mean that he will need a new castle nut if resonable care is taken.
     
  18. Ruger52

    Ruger52 New Member

    120
    0
    0
    Man I am telling you, it sure looks like it is. The gas key is tight, after 3000 rounds. I do keep an eye out for loose stuff, as I am a cleaning freak.
     
    Last edited: Nov 29, 2012
  19. Ruger52

    Ruger52 New Member

    120
    0
    0
    Quentin and Brad, thanks for the replys on the castle nut. I haven't had time to mess with it latley, but perhaps this coming weekend.
     
  20. Ruger52

    Ruger52 New Member

    120
    0
    0
    Got off work early today, and popped the castle nut off, and viola, I have a new end plate with a sling ring. Forgot about the spring in the buffer hold pin. It flew out, but with my quick eye I saw it hit the wall, and found it and the spring. Whew, that was a close one.