Boom Beach Rifleman guide - Level 2
The second level of the Rifleman is a nice little upgrade over the base unit, but it's not massively more powerful.
As with all troops, they still have their strengths and weaknesses, regardless of level.
In the case of the Rifleman, Machine Guns and Flamethrowers are their particular Achilles heel, and by this point in the game you'll be running up against them fairly often.
Use this time to experiment with different approaches, as the unit is cheap and fast to create right now, and you'll learn a lot about strategic nuance simply by getting your hands dirty.
Some helpful numbers for you;
Rifleman - Level 2
Health - 150
Unit Size - 1
Training Cost - 50
Training Time - 1m
Movement Speed - Moderate
Range - Medium
Damage Per Second - 32