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First a caveat, of the three generations of Marines, still alive in my family, none use the .223/5.56 round and for short to medium range shots, we all use the DPMS Gen 1 pattern rifle, chambered in .308/7.62. That being said, over gassing is an issue. Some of this you may not need to do but will give you a better rifle. Use an adjustable gas block, Lap the upper, starting with 220 grit compound and finishing at 660 grit or finer, get a Nickel Boron coated BCG (Johnson bolt) that vents forward, Lantec makes an excellent one. Last but not least consider either a JP Enterprises or Armaspec captured spring recoil rod. I'm sure that someone on the forum that lives nearer you has a lapping tool for your upper that you can borrow and there has to be a video on Youtube that shows how to use one. If no one near you volunteers one, let me know and I'll get back mine from my grandson and send it over with instructions. I cannot speak to the best charging handle as I haven't used one since before your mother was born. As always if you take your time and use best practices, you will end up with a fine shootin iron, that will give you sub MOA @ 100 meters, if you want a tack driver @ 1000 meters, we need to have a different conversation.
Hope this helps, please be well.
Hope this helps, please be well.