Noticed that only people who are hit by sr8 have problems.... Then don't get hit. Once g36 hits you in legs you're dead, but if 5 sr8s miss you, you're still alive. Believe me, most of sr8 campers can't aim, so simple walljumping will make them miss.
And automatic weapon will hit even if player missed, at least one bullet, which is enough to make you slowpoke who will get hit by all other people.