BUIS for G45 with RMR

**CrowCommand** · 02-08-21, 12:46

Searched around a bit, but couldn't find anything concrete.

I'm getting my Gen 5 G45 milled to accept an RM01 Type 2 RMR. Trying to figure out sight heights for a lower 1/4 or 1/3 co witness.....just not sure if that is dependent on the depth of the mill cut, or if there is a standard depth they mill the slide to. Looking at Ameriglo night sights.....the "agent" model is one I keep coming across.

Any help is appreciated.

**ggammell** · 02-08-21, 13:22

You will need suppressor height sights, even for a milled slide. Standard height glock sights will not be high enough to use on their own with an RDS in between them.

Ameriglo suppressor height in all back are very popular. There is not much need for tritium iron sights on a dot gun, especially if you put a weapon light in the gun. Also, adding another hi viz aiming system in there is a potential distract or to the dot.

**CrowCommand** · 02-08-21, 15:02

That’s good point about the night sights.

However, I don’t believe there is just suppressor height and standard height. It looks like Ameriglo offers different heights in the elevated/suppressor sights. Hoping someone might chime in that may know what height would be best for a lower 1/4 or lower 1/3 cowitness.

Thanks for the reply, ggammell.

**ggammell** · 02-08-21, 15:18

The GL429 suppressor height weights are the tallest you want unless you have to change you POA/POI based on load. Anything taller than that is well above the height you want.

**m1a_scoutguy** · 02-08-21, 15:28

I put these on my 19X and couldn't be happier. Black all the way around and for me on the 19X the POI is just fine. G45 is same thing only different as they say but these should be fine for you I would think, I also run a RMR. I have not shot @25yrds but @15yrds and up they are good.
https://dawsonprecision.com/dawson-p...ed-dot-scopes/

**Inkslinger** · 02-08-21, 16:44

I wouldn’t really worry about cowitnessing your sights with the dot. What makes the dot excel is its ability to allow you to target focus. If you start making your eyes do the dance between sights, dot, and target, your putting yourself at a disadvantage. If your dot is in the glass, then all you need to see is it and the target. If for some reason there is no dot, then use the irons. Just get a quality set of suppressor height sights and know where your POA/POI is at known distances. Zero your dot at your preferred distance and don’t complicate things.

**RWH24** · 02-08-21, 17:39

Ameriglo GL-470 is what I have on my G19.5 slide on my G45 frame.

https://www.bigtexoutdoors.com/produ...t-rear-gl-470/

**RWH24** · 02-08-21, 17:49

Originally Posted by Inkslinger

I wouldn’t really worry about cowitnessing your sights with the dot. What makes the dot excel is its ability to allow you to target focus. If you start making your eyes do the dance between sights, dot, and target, your putting yourself at a disadvantage. If your dot is in the glass, then all you need to see is it and the target. If for some reason there is no dot, then use the irons. Just get a quality set of suppressor height sights and know where your POA/POI is at known distances. Zero your dot at your preferred distance and don’t complicate things.

CORRECT!
Front sights with dots or night sight draws your eye to it and not your RDS.
My Milled slides from ATEI have the rear sight in front of the RMR.
The MOS for Glock is rear to rear. Confused my brain which is an EZ task.

**CrowCommand** · 02-08-21, 18:03

Thanks fellas. I guess I am looking to not exactly co-witnessing the dot with the irons, but be able to use the irons, should the dot ever fail (highly doubtful with the reviews I see on the RMR). The GL470 looks a bit high IMO (but thank you for the pic), I will most likely try out the GL429....Luckily, you guys talked me out of the night sights, so, if I don't like the irons I put on, I'll only be out $50-60 instead of $80-100.

**RWH24** · 02-08-21, 18:32

Originally Posted by m1a_scoutguy

I put these on my 19X and couldn't be happier. Black all the way around and for me on the 19X the POI is just fine. G45 is same thing only different as they say but these should be fine for you I would think, I also run a RMR. I have not shot @25yrds but @15yrds and up they are good.
https://dawsonprecision.com/dawson-p...ed-dot-scopes/

310_074__96666.1557248862.jpg

The picture shows the rear sight is below the top of the RMR. Can you confirm?