So, you got the standard Remington 1911 R1, I see. Let me tell you what I had to do, and what you should look for.
First, an odd thing, the pivot hole in the hammer was reamed off kilter, and the hammer leaned off to one side. It functioned, but that simply will not do. Remington customer service would not simply send me a hammer, but wanted me to send the gun to a third party repair center. I didn't really want to do that for just a hammer. I found someone on ebay that had new Remington hammers, ready to go, so for $29, I fixed that myself.
Second, the mainspring housing was basically undersized. It functioned fine, but was loose in its mortise and drove me crazy. It has been replaced with a snug-fitting Smith and Alexander arched mainspring housing (I need the arched housing anyway).
Third, the feed ramp was like a washboard. Horizontal mill marks all up and down the feed ramp. FMJ ammo fed alright, but you could see how hollowpoints would dig into the ridges, and just stop. Fine sandpaper on a dowel rod, very carefully operated, smoothed the ramp out enough that it now shucks hollowpoints through, no problem. It does not need to be super shiny polished, just smooth enough.
Other things I did to it, were just because these are things I wanted to suit me. Thicker, wider grip panels, fitted barrel bushing, sights (oh, by the way, the Remington dovetails are NOT STANDARD.... which makes things rather difficult), long trigger, replaced the magazine catch for a standard length Colt part (I don't like the extended button), removed the series 80 firing pin block contraption, and various other little things.
This gun is an i-dotter now, and with me always.
