I bought a threadded 700 sps tactical/16" last December for under 7 bills, I've not had any issues with it at all- it's an RAR serial number. I havent shot it much, but it will hold at least 1 moa with a few different loads during break in--- I havent started reloading for it yet so I can't tell you what kind of group it will print.
If you look at the detailed descriptions on the remarms web page-- it looks like all the 700s have a 5r barrel ( the description of the ops gun on sportsmans web page serms to go further to say his model is a hammer forged barrel with the hs precision stock/ cerakote/fluted for about 12 bills)-- I'm gonna bet the op's rifle is a "special edition" made for sportsmans warehouse-- rem has done this for years, make "special" rifles for the big box stores....some I know of are Walmart, dicks, sportsmans, academy, basspro/cabelas, etc.
I'll bet the op got one that has a few issues-- this is normal across all mass produced rifles I've seen, heck even some upper tier production rifles like christiansen, Kimber, fierce have gone through qc issues in the past.
What I want to know, is when you contacted remarms about your issues-- how was their customer service?