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Posted: 1/22/2012 9:36:34 AM EDT
I am trying to take off the receiver end plate and replace with a sling attachment end plate. I have a DPMS and I for the life of me cannot get the castle nut loose!!!  It has started to booger up the threads on the stock assembly. This is my first go round, but is it supposed to be this hard. I was afraid I would break od=r bend the receiver. Using an AIM armorer's tool. Any advice would be greatly appreciated.
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They use that method for the same reason many people stake their castle nuts. By ensuring that the nut cannot back off during the rigors of your weapon sending round after round down range. There are lots of arguments for staking them or not all over AR15.com, but basically, it's your call (or the manufacturer's call) in the end. I'm not trying to resurrect the argument, just telling you why DPMS saw fit to slap Loctite on your threads.
P.S. - When I was new it took me forever to figure out that "staking" just means intentionally damaging the threads on something to ensure that whatever was threaded on to them cannot move. Just in case you thought I was using gobbledygook language. |
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Quoted: Staking does not damage any threads, intentionally or otherwise. The staking is done to the part and does not come anywhere close to the threads, if it does your doing it wrong.P.S. - When I was new it took me forever to figure out that "staking" just means intentionally damaging the threads on something to ensure that whatever was threaded on to them cannot move. |
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Quoted:
P.S. - When I was new it took me forever to figure out that "staking" just means intentionally damaging the threads on something to ensure that whatever was threaded on to them cannot move. In the mechanical and construction trades we always called it "peening". Basically moving the metal by force. It's what the "ball peen" hammer was invented for. 
Quoted:
Staking does not damage any threads, intentionally or otherwise. The staking is done to the part and does not come anywhere close to the threads, if it does your doing it wrong. In the case of the castle nut, true. (As a side note, since we're talking technical terms, why do we call it a "castle nut", when it isn't a castle nut at all? The TM refers to it as the "round plain nut".) But in the general sense, staking and/or peening does distort the threads. We have peened the threads of a bolt/nut connection on a lot of fasteners in construction. When done properly, the threads normally return to a somewhat normal state when the nut is removed. |
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