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z APS Airsoft M4 Metal Body + Complete Gearbox Challenge DIY Kit Set
by Carrie L. Date Added: October 9, 2010
Well I bought this thinking that it would be a good replacement for my Echo 1 gear box that recently gave out. I was wrong this gearbox sucks. I had to buy a new motor and a spring to go with it.

Metal Body

Metal Feels Cheap
to big of stock spring

Webmaster: The description stated this gun shoots 400 FPS....if your Echo1 is old type with standard motor, it is just standard rule to power a 400 FPS with torque up motor. Or, you can always get 9.6V good battery, or change to lower power spring like you did.

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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