Yes, feed ramps should only concern you if you are changing the barrel or going full auto.
The are all part of the upper and have nothing to do with the lower. All Ar15 lowers will take either or.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul