So I've been playing Monster Hunter since the PS2 days but have never really used Bowgun much and have decided this time around that I want to main it for online play. Can any of you bow gun users give me some recommendations for early game armor and wheather I should use light or heavy bowguns?
Whether to use light or heavy bowguns depends on the style of play you like.
Light bowguns are very mobile; your movement speed while unsheathed is pretty fast and they sheathe/unsheathe very quickly. Their gimmick is the rapid-fire mechanic which multiplies a single shot into several bullets fired off machine gun style, but your hunter is anchored in place until all those shots are fired (which can get risky when rapid-firing a lot of shots).
Heavy bowguns are not so mobile; walking speed is slow while unsheathed, and they take a long time to sheathe and unsheathe. Each shot is quite powerful, however. Their gimmick is crouching fire which anchors your hunter in place in exchange for a large clip of powerful full-strength shots. But being anchored in place can be risky and Guild style takes a long time to get back out again.
For light bowgunning, any sort of damage boosting armor set is fine in the early game (like that Bulldrome/Jaggi mix). But for heavy bowgunning, I prefer sets that boost my mobility (such as Nargacuga) in order to keep targets in range and compensate for its slowness.