I've used Award Masters previously as well. They engraved on a lower and did a decent job. The engraving they did for me appeared to be done with electropencil rather than a stamp or laser. However, I would have preferred the engraving be deeper (In retrospect I should have asked for it to be deeper). If your in Milton, Santa Rosa Jewelers does engraving work. I just dropped off a 870 receiver and by their statement they do a lot of engraving work for Santa Rosa Sheriff's.
Some other engravers I haven't tried yet.
MLR Jewelers in Pace.
West Florida Trophies and Plaques.
Write-Away engraving. (I emailed them and they said no based on technical issues.)
I got my 870 receiver back from Santa Rosa Jewelers today. $25 and they did an excellent job. The engraving is definitely deep and looks professionally done. They're in downtown Milton and I highly recommend them.