Bought off Ali for a customer build but never used.  I've checked functionality and it works as it should, although i've noticed some shadowing to the red dot.  Essentially it looks like a slightly small second red dot below the main dot.  I think this could be rectified by taking the front part off and reseating the laser in the housing. 

In my view this is a pretty good quality alloy/aluminium replica, you have a constant on/off, strobe and laser function, in both visible and infra red (i've tested both).  You can run the visible laser or IR laser independently or with the light/IR light switched on.  Takes two CR123A batteries.

I've checked the fit on both Glock and standard picatinny rails, and all is good!

£55 inc. postage and PayPal fees.  postage will be second class signed for or Hermes....

Happy to send further pictures.

Cheers.