Installed this stock on my Echo 1 614. Went on very easy, just slide onto the buffer tube. The only tools I needed were for removing the original stock. Wobbles very very slightly, and the buttpad is already coming loose, but these things are easily addressed. Not perfect, but then Im not giving it a perfect rating.
None the less, if I get another M4 style AEG, I would still get one of these for it.
Easy to install
slightly loose on the buffer tube (maybe a problem ONLY for echo1? )
buttpad needs to be tightened even before playing with it the first time (came out the box very tight)
Rating: [4 of 5 Stars!]