Bought new in box over a year ago and I ended up finding a cheaper setup. I never used for my Glock 17. Everything is unopened and in box. This has everything you you need to attach a Holosun Optic to a Glock 17 Gen 4. Ameriglo Optic Compatible Sight set for Glock The adaptor plate for a Glock 17. I paid over $600 for everything. I am asking $450.