Tapered barrel on HK rifles
The MR556 version of the hk416 has a tapered barrel.
Given that 556 is 5. 7mm in diameter, how small would the caliber reduction be... would the bullet be crushed to about 5. 5mm?
It's claimed to increase velocity but I don't known if that's due to a higher force behind the bullet, or literally because the bullet is slimmer when it leaves the muzzle (and thus has better ballistics)
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