A good person to talk to for advice would be SixByTen. He is...well...6'10" and usually plays with an m4. It does really depend on your personal preference though. I am 6'3" and I have no problem with a smaller gun. I do have a large and heavy custom DMR that might likely be more up your alley. It's built around an m16 which is a fairly long gun already. But if you're also looking for weight and not just length I can see how the m16 might feel small. Maybe finding a larger handguard could help or even trying a different way of holding the gun.
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