not really a 'v' its more like 4 vertical lines, a millimeter each, and they look like this: ' ' ' '
with the 2 on the outside a little shorter... Compared to the kwa stock (1ST gen), its a little thinner, but wider, so getting it in to the hop up unit is a little tight, so be careful, as it thin and easier to rip...
But inserted, its perfect, it works better than a stock bucking with a H HOP nub... You cant use them together because the h nub will squeeze the 2 main vertical nubs together like: ' " ' providing bad hop.
So id use a stock nub and this; such a good result with a tightbore and .25 bb
on the steep price side