We test each OPF-G, RMR on a G19 slide for plate to slide fit, and with a dual illuminated, and an adjustable LED RMR for sight to plate fit before shipping. OPF-G, RMR seconds have been set aside as they are a bit tight on our test G19 slide we use for testing, we offer them at 10% discount for the folks that don't mind doing some fitting on the plate In most cases, it's simply very snug. That it's a bit tight on our G19 slide can also be related to Glock's MOS cut tolerances (we believe it's +/- 0.005), what's tight on our test slide may be no issue on other slides.
Some of these seconds may have the laser engraving slightly off center, it's invisible once an RMR is installed.
OPF-G, RMR (Optics Platform, Glock, for RMR) is a Glock MOS Adapter Set
01 and Set 02 compatible plate for mounting Trijicon RMR or SRO on Glock
Gen 4 and Gen 5 slides, G17, G19, G34, G35, G41 (width 25mm/1 inch.)
and G40 that uses Set 02. Glock's OEM MOS plate's width matches that of
the slide, but OPF-G, RMR is already wider to fully support the RMR,
thus it is compatible with all MOS equipped Glock slides.
We like the Glock MOS concept, even if we find the factory MOS adapter plates could use some help. Standards, commonality, availability of parts are all good things. Heretofore, users have had to send in their slides to be milled to accept mini red dot sights, or opt for 3rd party optics ready slides. The time it takes to send in the slides to be milled, and varying quality of the milling work and optics ready slides notwithstanding, there was a lack a standard regarding the sight height, it'd be a coincidence if two slides milled by two different shops share the same sight height. Glock's MOS may not sit as low as some, but in our opinion, what MOS offers more than makes up for it, namely a uniform sight height, ease of installation, parts commonality and availability.
OPF-G, RMR is a collaboration with a USMC combat veteran and former USMC Shooting Team head coach, Tom Shields. We used Glock's MOS adapter plates as a basis, and designed our version of what we think it should and can be.
OPF-G, RMR's shape follows its functions, same as all of our products. We outlined the following objectives:
1. Sight is to be fully supported in the front and rear by recoil lugs/fences, with minimum movement.
2. Eliminate the need to use an additional sealer plate.
3. Correct length sight to plate, and plate to slide screws. Screws are to be Torx.
4. Adapter plate is to be machined in steel.
OPF-G, RMR accomplishes all of the goals outlined above. OPF-G, RMR's thickness is unchanged from that of the Glock MOS plate, it doesn't change the sight's mounted height, nor does it require different iron sights.
OPF-RMR is shipped with plate to slide screws (M3-0.5mm x 6mm, same as what Glock MOS plates uses), and sight to plate screws (6/32 x 3/8), a T10 key and a VC3 packet.
Plate to slide torque value: 13 to 15in/lb
Sight to plate torque value: 13in/lb
Proudly designed and made in the USA.
OPF-G, RMR is designed to sandwich the sight in its front and rear fence, we make the spacing as close to Trijicon's dimensions and tolerance as we can. Though we hold a 0.003 tolerance, Trijicon's estimated tolerance is 0.005. In practical terms, this means while some RMRs will move inside the fences by a very small amount, others will need to be forced into the space.
Trjicon RMR and SRO share the
same mounting footprint, OPF-G, RMR is also compatible with SRO.
However, due to the precise fit of the front and rear recoil lugs/fences
that are designed to closely sandwich the sight, OPF-G,
RMR is incompatible with all Holosun sights.while 507C and 507c V2 fit almost perfectly, and 508T fits, but exhibits more movement along the bore than we like. 407C will not work without fitting. OPF-G, RMR ships with RMR/SRO specific sight to plate screws that will not work on any Holosun sights.
Our friend Gary W Thomas II, AIA, NCARB has put it in engineering terms:
understand the concerns with the Glock OEM MOS plate an explanation of
the loads imparted upon the fasteners is required. When the handgun is
fired, the recoil generates a lateral load in the direction of the
slide's movement. This load is transferred through to the fasteners
connecting the plate and optic. The Glock OEM plate does not maintain
the optic in statis thereby imparting dynamic lateral loads upon the
fasteners at the fastener shear plane. These loads cannot be resisted
by the fasteners indefinitely and may result in mounting failure wherein
the fastener shears at the shear plane.
Design's solution is to maintain the optic in a static position relative
to the lateral load path by adding fore and aft recoil lugs about the
optic. The front lug resists the dynamic load imparted by the slide
inertia during the slide's rearward travel (ejection cycle) while the
rear lug resists the dynamic load imparted by the slide inertia during
the slide's forward travel (feed cycle). Therefore, OPF-G, RMR
maintains the optic in a static position relative to the fasteners and
thereby effectively reduces (if not deletes) the dynamic lateral load
imparted upon the fasteners at the fastener shear plane.