Hello everyone. This is my first time posting. I'm new to firearms and recently bought my first carbine (it's actually a CAA carbine conversion kit for my 9mm pistol) and need a riser mount to use flip sights with a green dot sight. I tried a .5" riser and it was a little too high for my liking, so I'm looking for a riser that elevates by .25" - .33". I'm having a really hard time finding this height at my local stores and online. Does anyone have a set they are willing to sell me or ideas for places to buy a set (I've tried Amazon, eBay, and several online firearm and ammo websites)? Thanks!