Burris Fastfire III - 3 MOA red dot sight. I've only had it mounted on rimfire guns so you can definately consider it lightly used. Works and looks great. 

Comes with dust cover, and all mounting hardware for most Ruger Mark series pistols. (I had it on a Mark IV 22/45 Lite)

All Burris optics come with a fully transferable lifetime warranty, no receipt required, no questions asked so there's really no risk in buying it used.

You're looking at $270.00 + shipping and tax for this set up. Asking $225.00. 

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