The Holosun series of
compatible optics utilize DIFFERENT screws than what is provided by Bobro
Engineering for the Trijicon RMR series.
What are the
differences? The Holosun screws have a smaller diameter head (top part) than
what is used to mount an RMR, and the smaller diameter head Holosun screws MUST
be used. Holosun provides 2 lengths, one is 5/16” (short) and the other is 3/8”
(long) you MUST use the long screw.
If you use the short
(5/16”) screw you will not have enough threads engaged with the Bobro
Engineering plate, and this is INCORRECT.
The long (3/8”)
screws will be too long and stick out past the bottom surface of the plate.
You must file or grind these screws so that they are flush with the bottom of
the plate with the Holosun unit installed. This maximizes the thread
engagement and is CORRECT.
The plate that Bobro
Engineering makes is tapped for a 6-32 screw (for the optic) and double check
that the Holosun screws that you have are also 6-32 before installation. Since
Bobro Engineering provided the correct screws to mount the Trijicon RMR, it is
on you to ensure that the screws you use for the Holosun are correct.