M14
- Long and heavy
- Has more recoil
- Makes big holes
- Shoots farther
- Useless on full-auto
- Holds 20 rounds
- Ammo is heavy
- Takes a bayonet
M16
- Light
- No recoil to speak of
- Full-auto is fine
- Can use 20 and 30 round magazines
- Makes small holes
- Light ammo
- Maneuverable in tight quarters
- Takes hundreds of accessories from lights to grenade launchers
Both rifles are highly accurate provided the operator does his part and the ammunition is good.