Can a fish swim?:| That's like asking if a fish could swim.
Question is...why would a shinobi stand still and let a slow bullet hit them?
even a Genin Sasuke was Super Sonic...while having time to pickup and carry two people. Bullets are fodder to shinobi. (Decapitating air waves-Using the air tubes implanted in his palms, Zaku can control the ratio of air pressure and sound via chakra. By propelling this combination, he can release supersonic blasts of air. These blasts are powerful enough to destroy stone, and can also be used to soften the ground. By increasing air pressure to 100% and reducing sound waves to 0%, the blasts can be used to deflect thrown kunai.[2]) Zaku used a beefed up version on Sasuke.
After tree climbing a shinobi should have no trouble with bullets.
As for Kunai, who actually was killed by kunai (while in battle?) their just for diversionary tactics.