I recently added a spacer (total two spacers) to a Magpul SGA stock (on a 1301T). Mostly just because it felt better.
@TCinVA notes that even those with longer arms can utilize a 12-12.5 inch LOP well.
Surely though, at some point, too short is too short.
So, how should one decide where to stop shortening the stock?
Are there techniques to emphasize with a shorter than typical buttstock, particularly with a self-loader?
Personally, I have a 35 inch sleeve length and find that a tick under 13 inches feels best for me. Feelings can lie though...