RicMic: ramps can be polished and barrels can be throated to improve feeding. The small ejection port on the 1911s was opened and lowered a bit on the A1s I believe but brass dinged at the mouth can be dealt with I believe with a slightly lighter weight recoil spring. The brass gets dinged because the slide may not go all the way to the rear to fully force the spent case against the ejector and have it ejected properly through the ejection port; instead, the empty case is retained by the extractor as teh slide cycles forward under spring pressure and as the new round is stripped from the magazine, the empty case is forced against the forward opening of the ejection port and finally forced out (popped out, actually) - usually toward your forehead or in some other inconsistent direction and I believe that either the loads are too light to fully cycle the slide to the rear, the recoil spring is too heavy to allow the slide to retract fully to the rear, or the ejector needs refacing (surfacing).
The brass hitting your forehead is not a good way to keep score - I know....... but, that can also be rectified without any real problem - just make certain the slide retracts all the way to the rear to properly eject the empty casing, as mentioned above, as you need to assure the face of the ejector is contoured or angled sufficiently so that when the slide fully retracts with the empty case held against the bolt face by the extractor, the empty contacts the face of the ejector at a sufficient angle to be ejected through the ejection port without interference. I put up with hot brass to the forehead from my Commander for about 25 yrs until I got tired of it and fixed the dang thing by angling the face of the ejector. Works good now....
When you take a look at range brass, you can find some with the mouth dings but you can find a awful lot without any dings or marks at all, which usually indicates a properly functioning pistol and if it is a standard 1911 or 1911A1 without a opened or lowered ejection port then it is functioning properly, or appers to be from the appearance of the brass. HTH.
