All of the Colt built ARs are chambered properly and intended for military 5.56MM ammunition, and yours has the preferred 1/7 Twist for this ammo. You can safely use both 5.56MM Military and civilian .223 ammo in all Colts - they don't do a .223 chamber, and Colt builds the very best production AR. The 5.56MM NATO chamber is slightly more generous than the .223, and thus you are good to go safely with both ammo types. The twist rate of the hard chromed Colt barrel is also current, standard US Military - and usually works best with the heavier bullets like the 62 grain, although yours may shoot the M193/55gr just fine, as my Government Carbine does. Green tip is "penetrator" (NOT Armor Piercing - that is different) and not designed as Match accurate ammo, but should shoot just fine. To test for very best accuracy, try a 69gr Match Loading with the Sierra Matchking bullet, or something like the Black Hills 77gr.
I find the Government Carbine, with it's modern twist and NATO Milspec chambering, combined with it's very lightweight "pencil barrel" to be the ideal AR - a light, handy carbine. Mine has the folding stock, and came to me equipped with the wonderful Trijicon Reflex sight with the 12MOA amber Triangle, on Trijicon's drop mount that puts it coaxial with the iron sights over the forend. No need for a flat top reciever with this setup, and no batteries or switches! Use the amber triangle for up close, use the tip of the triangle at long range - works great!
Run the gun wet with lube (disassemble, clean and inspect before first firing, new or used) I prefer Mpro7 LPX (or older Mpro7 CLP) lube, particularly the bolt group. Get a cleaning rod guide that fits in the upper reciever to protect the barrel and a coated rod, like a Dewey, is a good idea. Enjoy, you have a very special gun there. CCInformation
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