Key M4 upgrades according to the video:
M4 Feed Ramps
H2 Buffer
Extractor Spring
SOCOM Barrel Profile
14.5" Barrel Length balances multiple factors well
Magpul Anti-Tilt Magazine Followers
Magpul PMAG
Improved Ammunition - Mk262, Mk318, M855A1
Not a surprising list to most people here, but a good reminder of the small but meaningful improvements that make the platform great today.
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