3/5 missed draws, fire one last barrel?

[kevdawg21]

Live game, 3/5 blinds. Table has been very loose, but shortly before this hand the berzerk guy went bust and things started to calm down. I've been at the table for about 2 hours and have played very tight. I haven't raised a single hand pf (frozen wave of garbage) and have won every pot I bet or raised any street (about five pots, each time at showdown).

Villian in this hand is weak tight.

Chip counts:
Villian ($380)
Hero ($410)

Hero is CO with 6 [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/diamond.gif[/img]

Preflop: 3 folds, villian calls, MP calls, hero raises to $20, button folds, SB calls, BB calls, villian calls, MP calls.

Flop ($100): A [img]/images/graemlins/diamond.gif[/img] Q [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/diamond.gif[/img]

SB checks, BB checks, villian bets $50, MP folds, hero calls, SB folds, BB folds.

Turn ($200): 5 [img]/images/graemlins/spade.gif[/img]

Villian bets $50, hero raises to $170, villian calls.

River ($540): 2 [img]/images/graemlins/club.gif[/img]

Villian checks, hero...?

Should I fire one last time or give up? He instacalled my turn raise and he's only got $140 left. What do you put him on? Is my line OK otherwise?