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3/8" dovetail mount, for example mounting Red Dot Sights. It comes without M4x25(M4x30 also works) screw or nut. For airsoft AEG's like: Star Ika Zucchi, thundermaul etc. and other JG M4 based handles. Designed for Strong and Flexible.
Note: Only the Star Ika Zucchi is legal in NL. http://www.nabv.nl/?p=702