Yes , I am aware of the tech sights, william's peep , mojo sights , etc.
This is just something I spotted on ebay , and thought it was interesting enough to share on here.
I'm not affiliated with this guy or this product. Just passing this on because I thought it was interesting.
I think it needs more tweeking. I dont care for the hole drilled straight through. I think it should be stepped in (countersunk) ,
but it's nice to see somebody trying to offer something different , and his price seemed fair. even free shipping !