I apologize, there was an error on my last response. The mounts is made from Aluminum and weights 0.9oz.
The SI-G-SURF is compatible with GLOCKâ„¢ GEN3-5, Models 17-39. The Glock 19 Gen5 will work with the G SURF.
The Strike Industries Scorpion Universal Reflex Mount for GLOCK will not work with a Glock 44.
The Strike Industries Scorpion Universal Reflex Mount for GLOCK will work with a Glock 20 Gen 4.
The Strike Industries Scorpion Universal Reflex Mount is compatible with Glocks gen 3-5, models 17-39. Although Strike Industries does not say if this will work with the retro model, it should fall into the gen 1 category and not be compatible.
It goes into the rear dovetail so it will fit your glock. The Delta Point Pro has the same footprint as the shield and romeo so it should work.
As for the SURF mount, it should fit as the Romeo uses the Shield footprint.
Yes, this will mount optics such as the Vortex optics that utilize the Docter/Noblex footprint, among others.
This mount will not accept the Holosun 407/507k-X2 optics as it is not made for their mounting footprint, but it will accept the Holosun 407/507C-X2 and 508 optics that share the Trijicon RMR footprint. It is compatible with Glock Gen's 3-5, Models 17-39.
USPSA rules are frequently changing, and the use of optics is dependent on the Division in which you are participating. It would be best to speak with your USPSA Range Master on using this mount for competition, or refer to the USPSA Competition Rules.
https://uspsa.org/viewer/2021-USPSA-Competition-Rules-March-2021.pdf