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Posted: 10/2/2014 4:51:49 PM EST
Here's the punchline: I have a complete Bushmaster lower that I bought in 2002 or so, and it's been sitting in the safe ever since. I thought I would change out the buttstock from the collapsible "looking" stock...it's a non-collapsible from the dark days.

I have a lower receiver block, and a spanner wrench...and that castle nut is not effing moving. WTF??? It's as if they used nuclear strength Loctite. I actually broke the tooth on my first spanner wrench. Is there anything special that I might be overlooking?

Yes, I'm trying to loosen counter clockwise.

I cannot see that it's staked.

Hell, I'm wondering if I need to heat the nut up a bit with a Bernz-O-Matic.

No way should it be this hard.
Link Posted: 10/2/2014 4:57:32 PM EST
There is a chance threadlocker was used, apply some heat and see if that yields results.
Link Posted: 10/2/2014 4:58:18 PM EST
They probably used Red Loc-tite on it instead of staking it, (dumb)... I would take out the buffer and the spring, then heat the receiver extension up near the castle nut slowly for a bit and see if that allows it to budge for starters.
Link Posted: 10/2/2014 5:03:39 PM EST
[Last Edit: 10/2/2014 5:03:51 PM EST by AR18]
You can use a cheater bar for more leaverage.
Link Posted: 10/2/2014 5:06:51 PM EST
I also think you should use a bit of heat after removing the spring and buffer.
Link Posted: 10/2/2014 5:15:04 PM EST
[Last Edit: 10/2/2014 5:16:10 PM EST by nitsuj890]
I have a Bushmaster from 2010 that came with the same kind of stock. That castle nut was so tight on there I thought I was going the break the lower in a mag block. They dont use loctite but It took me forever to get the thing loose
Link Posted: 10/2/2014 6:07:20 PM EST
HammerHead Rifle Tool with a breaker bar removes all castle nuts with ease.
http://hammerheadrifletool.com/HammerHead_Rifle_Tool/HammerHead_Rifle_Tool_Home.html
Link Posted: 10/2/2014 6:09:47 PM EST
[Last Edit: 10/2/2014 6:09:47 PM EST by Lancelot]
Topic Moved
Link Posted: 10/2/2014 8:01:32 PM EST
Make sure you have a good wrench. There are some cheap ones out there that only engage one notch on the nut. Get one that engages at least 3 of the notches. I use a RRA wrench, see link below. If the nut is on there tight I hold the wrench firmly onto the nut then whack the end with a small hammer. Haven't had a nut yet that didn't come loose using this method, including staked nuts. I use a receiver block in a vise to hold the lower while removing / installing the nut.

http://www.brownells.com/gunsmith-tools-supplies/rifle-tools/wrenches/ar-15-m4-stock-wrench-prod16882.aspx
Link Posted: 10/2/2014 8:57:48 PM EST
Done. A little heat fixed things up in a jiffy. POS "tele-style" stock is a shitty stock/buffer tube all-in-one...so I need a new buffer tube. Regardless, I got it. Thanks.
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