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Finished project: Replaced the factory fixed M4 stock with a Colt N1 Fiberite CAR-15 stock and 4 position tube, and replaced the heavy factory epoxied, dual heat shield M4 handguards with CAR-15 7-hole slim handguards, both from a Colt 6420 lightweight carbine. Magazine is a Colt 30 marked "62667" that dates back to my USAF reserve days.
Knocks it down under 7 pounds, and feels better in the hand. I also replaced the horseshoe BCG with a newer Colt M16 BCG for more reliable feeding. The safety lever is a Colt reversible one from a late 6920.
After the range results, the 6400C, loaded up with 77 grain MK262 MOD1s, has become my go-to rifle, pushing ahead of the AK and Mini-30. It is just stupid reliabl;e and more accurate with irons than any other rifle I own!
https://www.milsurps.com/images/impo.../lUAQKEy-1.jpg
https://www.milsurps.com/images/impo.../PMqEaBo-1.jpg
https://www.milsurps.com/images/impo.../qeVLt3S-1.jpg
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I do prefer the slim handguards...and the side sling swivel. Nice.
