What is the difference between a AR 15 and a m4?

Related questions

1. Who makes the m4 carbine?
2. What size bullet does a m4 shoot?
3. What is considered a military grade weapon?
4. What rifle does Israeli army use?
5. Are Blackjacks legal?
6. Who makes AR 15 for US military?
7. Will a BB gun stop an intruder?
8. What round does an m16 fire?
9. Are the m4 and m16 the same gun?
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20. #firing