They are Douglas Barrels on REM 70ML.
$370 is alot but it all depends on how bad you are some else wants it and is willing to pay.I love my REM 700 ML and while i do love it,i would not give that much for it and as some one already posted it.The 209 conversion Kit alone will cost you $55.00.
$300.00 is a fair price for one with the #11 cap type gun.
PS: i did not give but $210.00 for my REM 700ML 50 cal Stanless off of GunBrokers.com about 2 years ago and it was just like new.Not a Hair out of place on it are in it,LOL