I have an A2 upper with rifle feed ramps. Anyone know who sells 20" barrels (with FSB preferred) WITHOUT M4 ramps? Wanting to build a classic A2 rifle.

You may get better/more help in the A2 Forum: https://www.ar15.com/forums/ar-15/A2-Builds/127/

These Delton's shoot really good

http://www.jsesurplus.com/Del-Ton205.56GovernmentProfileBarrel1x9Moly.aspx

Thanks.

While there is nothing wrong with that unlined Del-Ton Barrel I would highly recommend you look at the chrome lined Green Mountain barrels.  Green Mountain is top of the line IMO and make some really awesome shooting barrels for the money.  TNTE Sales has their barrels with the FSB already attached for $235.

Link To A2 Barrel

That barrel comes with the barrel nut & hg cap too from the looks of it.  I have never ordered from TNTE before but have heard many good things.  I am not sure if they say the barrel is Green Mountain anywhere but I am about 99% sure it is.  You could always call to confirm.  

Another good option many go with is the Windham Weaponry A2 barrel for $215 - Link To Windham A2 Barrel

If you already bought the Del-Ton then disregard, but if not then I would recommend GM/TNTE first & Windham second.  For the extra money you are getting a chrome lined barrel & a better barrel overall.  Not that Del-Tons can't be good shooters but Green Mountains are generally exceptional in my experience.  

M-4 ramps.

M4 feed ramps work fine in a receiver that is set up for rifle feed ramps. I have Windham A2 barrels on both my A2 and C7 clones, have fired both plenty with no issues.

How about this from Numrichs?  

https://www.gunpartscorp.com/products/1481760