I had the oppertunity to try out the tm rds and id have agree with brian they are less than ideal. I own a tm p90 tr with my own optics and have to say it's the better way to go. Also keep in mind the echo1 (I've read) cannot be modded for j battey. Not sure about class. arm. My modded tm fires at 360 w/ .20 and rof of 16/sec. I've also ordered the echo1 but haven't used it yet.
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