I would definitely go with the Combat Machine. It is my primary and I have not had any issues with it. Mine has the pnuematic blowback, but it still works flawlessly. To be honest, the performance was even better than I expected as I have recorded some fairly long kills for a gun with a standard M4 length barrel (nothing ridiculous, but it's pretty consistent during use in outdoor/field games). Also, the durability of the plastic body is incredible, yet still very lightweight. If you have any other questions about it, feel free to ask.