Let's see what I have from the list:
The rifle - ( working on that as we speak)
Sling, small arms (silent sling) - Have to go pick one up, but I will have it.
M7 Bayonet & M8A1 sheath - Yes, indeed
Plastic coverall bag & rubber band - Not yet
Cap, Protective, Dust - have like five of them
Several of the reproduction Chu Hoi bags - have one, picking more soon.
USGI 20 rounders with aluminum followers - I have about 20 of them
USGI 30 rounder with black follower - Fat Fifty full of them
M1967 20 round magazine pouch(es) (I have two fo the nylon ones, the older canvas ones are a PITA to find.
LC-1 30 round magazine pouch - I have one original with the flaps on it.
7 pocket bandoleer(s) - picked up two of them at my local surplus shop
Cleaning kit with the Alice pouch (case, maintenance equipment) - Yes, but i have to get the old pouch in OD.
Cleaning kit case for the buttstock (case, small arms) - My buttstock is a non-trapdoor model.
USGI field gauge & USGI armorers wrench - Nope
Reproduction M261 .22 Conversion with 2 USGI magazine inserts - Nope
A variety of manuals and training materials - repro GI cartoon mag and 20P direct support manuals.
One thing missing here is a Colt manufactured M3 Bipod with pouch.