What stock wrench do I need?

[SoDak]

I want to get a stock wrench so I can remove the collapsable stock on my dad's bushmaster. The problem is that I don't have access to the rifle right now and I don't know what castle nut it has. The gun is from the early 90s with a 2 position fiberite stock. Would I need a CAR stock wrench or the newer style stock wrench? Could I just get a CAR stock and would it work on either? Thanks.

[Robb Jensen]

If you're only using a few times, this one.
http://www.brownells.com/aspx/NS/sto...STOCK%20WRENCH

If you're going to use it a lot, this one.
http://www.brownells.com/aspx/NS/sto...TTSTOCK%20TOOL

The M4 stock nut wrench sold by www.specializedarmament.com is fantastic but it doesn't fit commercial tubes.

[SoDak]

It sounds like I'm dealing with a CAR castle nut, so now what do I do? PK Firearms has this CAR wrench.
http://www.pkfirearms.com/store/get_...0&term=58&pg=2
Are those even remotely good? All it has to do is be able to loosen up what I think is an unstaked castle nut at least once and it shouldn't be needed after that.

[m-w]

I have the Rock River stock wrench. It will work fine for what you need it to do and is inexpensive.