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I.C.S. split mechbox is the easiest to work on that I've found because you don't have to take the whole box apart just to change a part in either the upper or lower. Aside from the obvious advantage of being able to have an upper for indoor/cqb and another for outdoor with a higher fps spring, you can change it out in under a minute. Even with the pains of all the proprietary parts with an I.C.S, I don't think I'll buy a different brand of M4 because they're a dream to work on!
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