Well, I'm thinking now that I'll get 2 M17S Bullpups, and 1 AR.
Son # 1 wants my AR when I die, so I figure I'll give him a Bullpup now, so he's not stuck with 2 AR's.
Son # 2 is in the Army, so he won't be that excited about an AR (after having his own full-spray M4), so I'll give him my AK47 when I kick the bucket, and give him a Bullpup now.
Son #3 wants my Marlin 1894P lever gun when I'm history, so I'll give him an AR now.
That way they won't end up with two of the same guns. Variety is the spice of life. On the other hand, you might argue that no one ever had too many AR's!
I won't give them a rifle until they pass a life milestone. #1 is an engineering student, so I'll give him his when he graduates. #2 may get his when he gets through Airborne school. #3 is just in 8th grade, so he's got a long wait ahead.
Meanwhile, I'm stockpiling magazines for their guns.
(I'm not planning on keeling over soon, just thinking ahead!)