I think it's funny how the Army will outfit the new soldier with gloves in one size, and yet clothing sales will offer a range of sizes to fit correctly.
Gee, sizes of gloves mean hands come in different sizes. Hands in sizes mean grips in sizes. Big hands, big grips, small hands, small grips. I'm looking for a A1, I prefer it to the A2, like some others, the spur rides my hand at the wrong place.
Stocks come in different lengths too. Some of us even prefer long handguards.