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Old June 17th, 2009, 17:58   #26
Mr. G36!
Join Date: Jul 2007
Location: Beautiful Thunder Bay, where dreams become nightmares!
Anything you find for less than $50 probably isn't worth using. You'll have to spend a minimum of $75 to get something decent. And 20mm rails are the standard. Unless you get into certain sporting/hunting rifles that have dovetail mounts and whatnot, just about everything is 20mm rail-compatible. I don't think I've even heard of an RDS that doesn't mount to 20mm rails.
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