Hey
The
USMC's (Not US Army's) SMAW has a range of 500m and has both HEAT (Anti Tank) and HEDP (Anti structure/FOB/INF) rounds. It also comes with a spotting rifle that fires just a tracer (red bullet). The tracer should fly and fall the same way as the HEAT round, so you fire the spotting rifle first to see where the main weapon will land.
The SMAW also has BUIS (backup ironshights) you can use, by pressing 'C'. I think the BUIS is set to a range of 250m, so a bit further than the iron sights of the RPG7.
What makes the SMAW 'better' is that it has a total of 3 rounds, which is axtra HEAT and additional HEPD round. However, it is limited to 500m range, is unguided like the SRAW (Alt) and the spotting rifle gives away your position.
In addition, it takes too long switching between the weapons and the spotting rifle.
Its very satisfying once you learn how to use it
Hope that helps.
...mongol...