77 oop, flop checked through, turn gutshot

pre-flop aggressor is 12-5 and 13% steal over 250hands. 100% fold to cbet in this time, and c-bets 50% of flops. Guess he's kinda nitty and fit/fold.
his range pre-flop is likely narrow, something like 88+/AQ+. The flop check doesn't give much info.

co is 28-5 weak and will fold most of his range here, would have bet the flop with good holdings

Thoughts on turn play? bet-sizing?

Full Tilt No-Limit Hold'em, $1.00 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Button ($100)
SB ($100)
Hero (BB) ($114)
UTG ($101.50)
UTG+1 ($82.95)
MP1 ($112.95)
MP2 ($97.45)
MP3 ($112.70)
CO ($112.10)

Preflop: Hero is BB with 7http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 7http://www.flopturnriver.com/phpBB2/...miles/club.gif
4 folds, MP3 raises to $3, CO calls $3, 2 folds, Hero calls $2

Flop: ($9.50) 9http://www.flopturnriver.com/phpBB2/...miles/club.gif, 6http://www.flopturnriver.com/phpBB2/...miles/club.gif, 9http://www.flopturnriver.com/phpBB2/...es/diamond.gif (3 players)
Hero checks, MP3 checks, CO checks

Turn: ($9.50) 10http://www.flopturnriver.com/phpBB2/...iles/heart.gif (3 players)
Hero bets $6,


edited to describe both villains, thanks technician!

maybe weak? but i would have checked. lots of hands out there got you beat. possibly if you were acting last and it was checked to you i would have had a crack. A10s could be in their range?

i see you say villain but you have 2 opponents?

keeping in mind ive never played at these stakes.

yep

you're folding overcards, which is probably the worst case to bet, but checking is slightly worse

co can also call with a straight draw or a 6 which is a lot better than him folding because he's putting money in when behind