What's the difference between m4 and mk18?

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Tags

1. #between
2. #barrel
3. #carbine
4. #minor
5. #reliable
6. #answer
7. #inches
8. #standard
9. #question
10. #lower
11. #short
12. #allow
13. #modifications
14. #assuming
15. #length
16. #functioning
17. #difference