I have a BM Carbine XM15E2S.
And with the help of this board I am spending my first $100 in the following fashion:

LE Tactical Entry short stock from RRA in the color ....GREEN -$55 (7 1/2 ")

A rubber Hogue grip from Midway-$14.95

A HANDGUARD mounted broomhandle straight grip from Ergogrips -$37 (plus shippin')

Q:s Whats the difference between CAR 15 stocks and A 2:s

Will RRA above mentioned stock fit my BM OR  should I order the one Bushy has on their Website?

Also- any drawback to mount the grip on handguard as opposed to a rail on the handguard?

Next investement is positively an Aimpoint since I find some conflicting testaments rearding the otherwise frequently suggested EOTechs.

A well spent $100 - right ?