Three point tactical sling helps.
About the only ways to reduce weight on these things are:
- remove metal butt-plate (I chopped the stock and put on a Limb-saver)
- shorter barrel
- 5 round mag vs pinned 20 round
- don't scope it
- Carbon finer stock (if you want to spend some money)
Just about everything else ADDS weight.
Both my 14's are about as light and compact as you can realistically make em. One is a scoped DMR type thing, the other is just iron and about as light as possible (without going to a carbon fibre stock).