norc m4 spanner wrench size???

[f7 666]

Hi guy's does anybody happen to know the size of a spanner wrench to use on the norc m4. I was told that they might be a different size then others any info would be great. I bought a magpul asap adapter so it has to come apart and I need a spanner wrench just not sure wich one to get.
thank's marc

 

[enefgee]

I haven't measured the castle nut, but since the thread (on my first gen) is identical, I'm willing to bet a standard carbine stock wrench or AR multi tool will work for the stock

 

[waynesixgun]

An AR wench worked on mine..

 

[f7 666]

thank's guy's