For extra screws for the Primary Arms The PLx Cantilever Mount I recommend contacting Primary Arms.
The current selection of mounts offered by Primary Arms made in the USA are the GLx series mounts.
For technical support please reach out to Primary Arms and they'll assist you.
Yes, it will and you will want to make sure to get the model that matches the tube diameter.
Yes, the standard will be just fine on a standard AR-15 upper receiver with a flat top.
The best recommendation would be MPN: 910058
The mount will not completely allow the scope to clear a fixed front sight. Up to around 3x magnification, the front sight will be visible through the scope. Once you hit around 2x/3x magnification, the field of view should push past the front sight.
No, because it is a magnified optic, the sights cannot be effectively co-witnessed through the scope especially if the scope is not a true 1 power scope. The mount measures 1.5" to the center which means the sights will be visible through the scope up to around 3x magnification. That is when the magnification will push the field of view past the front sight.
Please email us at techsales@opticsplanet.com with rifle and scope information and we can provide appropriate mounting options.
Primary Arms does not list this information to be readily available. Please consult the manufacturer regarding their recommendation on torque settings for the ring tops.