Haha...reading my mind....I already decided that next time I place an order for parts or accessories, getting a Noveske plate for this AR.
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A WORD OF CAUTION! If you do not use the correct tools to include a vise block of some sort it will be very difficult and you can potential damage the weapon.
I recommend that you put some Kroil or similar oil on the whole castle nut area and allow it to soak in before you start your surgery.
That is partially correct. Unless the monkey who put it on backwards happened to over-torque the nut or put some crap on the threads that you can't see.
I am dubious of the claim that "it came like that". It could happen, but usually when one digs deeper they will find out that isn't the case. Remember when people sell things they are making a sale. If he really needed the money there is no way in hell he would say that someone dicked with it if it will kill the sale.
I also made the mention because of it being staked. Do a search of this site for all the people who have had problems breaking a staked castle nut loose. If this doesn't apply to you, then drive on.
Thanks again, will proceed with caution.
If it's not too late, would you post a picture of the staking itself?
Not a great picture, but I think it is visible:
http://oi55.tinypic.com/2nhkb5d.jpg
Based on that picture, it can be fairly likely that it did come that way from Colt. Colt's staking leaves a square-ish impression. It's a four position receiver extension too, right?
Colt stake job's can be a bitch to break loose. I agree with Beavo looks like a standard Colt stake. +1 on what IG says about Kroil and a block especially if factory Colt job, or done by some Fudd and decided to use red loctite...LOL