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ellwood epps is where I got the sa but id seriosly try an mcstar first I own both and I cant see any difference got to like a scope mount that recomends you whack it with a hammer to form it to the reciever sideplate(in the sa instructions)
thats why I held out for a arms18...took a while to track one down. took a while to read through all the info about mounts, well worth the time. I know I have a set up that wont fail.