if you thought the shorty AKs at RD were heavy, the l85 is going to be worse.
accuracy is in the tuning of the gun and certain components, length of the barrel has less effect than compared to real steel guns. We don't use rifling, our projectiles are spherical, so they don't auto gyro to gain stability from rifling. We get our range from the consistency (straightness) of the barrel bore, the consistency of the air charge and the quality of the hop applied.
Other smaller lighter guns you might consider would be an mp5 of some sort, either with the foldable or full stock. It's somewhat lighter than the m4 or ak. A g36C is also pretty short and most of the good brands available are pretty durable nylon fiber materials, not straight abs plastic. You're still looking at aroun 6-8 pounds for most guns though. Better start working out more.
A sling also helps take weight off your arms, so when you're standing around, you're not holding your rifle.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.