I have a Springfield Armory 9mm 1911 national match with a 4 digit serial number, first year of manufacture (1984). Really pretty gun with deep gloss blue finish, target sights, and colt cocobolo grips. I got a great deal on it and I soon found out why. It would not cycle anything to save its life and the trigger was like 15 lbs.
I took it apart to find the hammer and sear were all chewed up and wearing against each other. I think someone attempted a trigger job and cut through the hardening and the soft steel underneath was wearing badly. Either that or they were never heat treated to begin with. The outside of the gun looks great but every part inside the gun looks like it was machined in a North Korean prison out of melted down soup cans. Its the worst workmanship I have every seen in any gun ever, bar none. I replaced the hammer with a remington, the sear with a wilson, new springs, a GI A1 mainspring housing, cleaned up and smoothed the remaining parts and did a nice 3lb trigger job on it.
Onto the feeding problems, you could not get 3 consecutive rounds of FMJ ball ammo to chamber. Same every time, the round would nosedive a bit in the magazine and run straight into the feed ramp and stop. It has an unramped barrel and the feed ramp on the frame was almost vertical and there was a very defined edge from the feed ramp to the barrel ramp for the bullet nose to catch on. I tried reshaping the feed ramp and new magazines with no improvement. Finally I broke out the TIG welder and welded a new ramp onto the frame with stainless steel filler similar to a ramped barrel. I made the ramp extend all the way into the magazine so that the front of the magazines had to all be relieved to fit around the new ramp. I have not have one single missfeed since and its a nice shooter now. Thankfully I was careful enough when welding that the beautiful bluing was unaffected too.