By LMG im assuming you mean Light Machine Gun. Well the ones I've shown you in the past are great places to start. AirsoftGI.com provides quality reviews which can be helpful. When reading about the gun and/or reviews it's always nice to find about the internals (such as gears, motor, piston, piston head, etc.). Also do research on your own. After buying a LMG you may want to buy a better battery as most cases a stock battery won't have the desired battery life to it.
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