Re: DPMS AP4 Carbine .223/5.56
They're not a bad rig. I've got a buddy who has one. It shoots fairly well, but won't hold a candle to my RRA Coyote Carbine. If you got a good price for it, I'd say go for it. Right now, any AR is better than none at all. You can always swap out barrels, trigger, etc, later if it doesn't shoot as well as you'd like.
I like things that go "bang"... I love things that go "BOOM!"