2/4 Empire, take the free card or fire again

[A_PLUS]

Typical loose passive table.

UG+1 open limps, 2 other limpers to me on button, I limp along with Ac5c, both blinds come along

Flop: 2h 4c 7c

UG+1 bets, fold, MP calls, I raise. Blinds fold, two callers.

Turn Td

Checked to me...

There are 6BBs in the pot. I have anywhere from 9-15 outs. Neither player was out of the ordinary for a 2/4 table.

Whats your line and why??