The Echo 1 Ver. 2 Spring Guide is sturdily constructed from S303 Stainless Steel for the version 2 gearbox. And, this spring guide features bearings that prevents the spring from building unnecessary tension by twisting and distorting in its seat. This spring guide is OEM by Modify and imported under the Echo 1 name. Echo 1 series of upgrade parts are compatible with most major brands of AEG. You can expect the same level of quality from these parts as Guarder and Systema parts for a fraction of the price.
2014-01-29 23:49:21 D. SHAW verified buyer Product Information:
This is a great spring guide. It's constructed of metal, and is very durable. There's not much more to a spring guide than the standard operation, but this one is very well constructed.
Not really any cons I can think of, it's a great component.
2010-05-29 09:00:19 J. TRUMPOWER verified buyer Product Information:
Nice spring guide I needed another one because my old one wouldn't let me screw the stock into the back off it so I got this one.good bearings but I would only recommend this for high ROF guns not FPS ball bearings can fly out on high torque springs.
lets spring rotate freely for reliability
The box said it could support a M170 but I wouldn't count on it if you wanted to go high with fps get one with one polymer bearing.
2010-01-18 10:30:45 M. PEREZ Product Information:
Very strong spring guide. Bearings are a plus to have. These bearings plus the ones on the Systema Duracon Piston Head prevent the spring from binding. Must have for high rate of fire guns.
-made of steel
-bearings are a plus