Where could I get a barrel with ramp feeds. I want to get one for a LMT A4 uper reciver.

depends on what type of barrel profile you want and what you plan on doing with the barrel



there are plenty of dealers here in the equipment exchange offering barrels with extended feedramps

All AR barrels have feed ramps. If your upper  has slight feed cuts, you want an M4 cut barrel. If their are no cuts on your upper, you want regular rifle feed ramps on the barrel (the feed ramps/cuts are actually on the barrel extension, but for all practical purposes, the barrel extension is part of the barrel. Most any AR part vendors who sell barrels can sell you either type of barrel.