RCS has been known for their holsters and now they are expanding in to other markets as well. Here is the first example of the effort, the Freya. This is a magazine well for Glock 17 and 19. It was very well blend in with the gun. RCS said they will offer it for both Gen 3 and Gen 4. Price will be $94.99
Balor is a red-dot sight mounting system made of two pieces. One piece is for attaching the sight. This part replaces rear sight. The second part replaces slide back plate and allows the first part and second part to fit.
There has been similar system by Dueck Defense, but this is in two parts. It also has integrated front sight. Price is going to be $199.99
Both are planned for release in May.