I was deciding on becoming a S.A.W. gunner but don't know where to start equipment wise... I was looking at a USMC inspired loadout. My budget is $800 (including the gun) so i was looking for someones opinion on this, thanks!
May want to find the gun first and price out that piece of kit to find out what you have left. In that budget, you could pick up a decent M249, and just price out necessary gear accordingly with what there is left. Also bear in mind additional costs like batteries and BBs, as you are prone to go through more than one in a day.
Echo 1 is just a rebranding company, not sure who makes their M249 though. Either way, at $800 you could probably get a G&P with enough to spare for some gear. You really don't need a whole lot when it comes to airsoft LMGs, because you can just dump bags of BBs into the box mag directly. Although you haven't stated what you already own, if at all, in terms of gear. You still need BDUs, chest rig or plate carrier, pouches of some kind?