Hey Guys and Gals, I am building a AR and i know the adjustable stocks have to be pinned and welded. But  i bought a Magpul Stock MOE FCS Fixed Carbine AR-15 Stock. that is held in place by a nut and bolt. The stock is tight up against the Castle nut. And i read on the reviews on the site that a fellow NJer used it and when he went out to pa he liked it cuz he could remove it and use a adjustable. So my question do i still need to get this pinned and welded? seeing how even if u loosen the nut and bolt the only way to affix the stock is tight with the castle nut. like you cant loosen and slide it back like the adjustables. Thanks for your advice :-)

You are good. It can be removable. Just not telescoping. Pinned if it telescopes as sold. If it's a fixed stock you have no issue. Pinned and welded refers to muzzle  devices. 

This ^^^

^^^this^^^ Beat me to it Walt.  No pin needed here.

i thought so. Thank you awesome Folk!

NP