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Discussion Starter · #1 · (Edited)
Fixed position tall RDS mount

I had a few odds & ends in my parts box, and I came up with this as a possible RDS mounting solution on my Gen II... I have not fired it yet, but it folds & unfolds as it should. The dot is higher than the iron sights, but not too high, and it is easily picked up by my eye. I am dead on target with just a slight counterclockwise rotation of the rifle. The small diameter of the bolt tube helps keep this rotation to a minimum.

I plan to visit my local indoor range and zero it in this weekend.
 

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Discussion Starter · #3 ·
I wasn't totally satisfied with the first spacer I used, so I fabricated a new & improved spacer for the MOE rail section this evening. I ground the screws down so they don't make contact with the barrel. The Loctite should be set by time I get a chance to zero it at 20/100 yards later this week.
 

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Nice work, the gap between the M-lok Slots and barrel is ridiculously short. It makes a nice slim rail but I believe I'd rather have had it a 1/4" wider and not had to worry about hitting the barrel.
 

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Discussion Starter · #7 · (Edited)
I visited my local 25 yard indoor range this morning to zero in the Aimpoint. It took several rounds to get the dot adjusted - POI was low left & off paper at the start. I fired a total of 100 rounds of 115 gr. Winchester 'white box', and my S2K performed flawlessly. The center target was @ 20 yards, the facial target was @ 25 yards. All shooting was done from an offhand standing shooting position, so my adjustments weren't exactly U-D & L-R ... I'll need a bench & rest to fine tune the zero.

My fixed position T-1 Frankenmount remained solid, and appears to be a winner for me :D
 

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Discussion Starter · #8 ·
Ch-ch-Changes

Even though my fixed tall RDS mount worked, I've decided to keep it stupid simple (kiss) by using nothing but iron sights. The Combat Aperture Lever Actuated Folding Rear Sight from Performance Services LLC, and the factory front sight. I moved the SureFire Scout light to the side rail. :rayof:
 

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Even though my fixed tall RDS mount worked, I've decided to keep it stupid simple (kiss) by using nothing but iron sights. The Combat Aperture Lever Actuated Folding Rear Sight from Performance Services LLC, and the factory front sight. I moved the SureFire Scout light to the side rail. :rayof:
I reached a similar conclusion on my Gen 1 sights for my purposes; I use Todd's front blade with fiber insert, along with the lever rear. Great combo.
 

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Why did you opt to not use the red dot? I had a folding rail mount, but it was a little too thick to let the rifle fold completely, so I went with an MLOK section and offset rail, it works perfectly (so far) and still allows the rifle to fold and latch. It's pretty similar to what you came up with, and I'm happy with it so far, just wondering why you weren't?
 

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Discussion Starter · #11 · (Edited)
Why did you opt to not use the red dot? I had a folding rail mount, but it was a little too thick to let the rifle fold completely, so I went with an MLOK section and offset rail, it works perfectly (so far) and still allows the rifle to fold and latch. It's pretty similar to what you came up with, and I'm happy with it so far, just wondering why you weren't?
I appreciate your question, because I did continue to experiment with various RDS and found a good compromise that works for me. I am using a EOTech EXPS2-0 with the factory throw lever riser mount, it's mounted as far forward as possible. My SUB doesn't fold 100% & lock, but it does fold enough for my needs. The iron sights will be my emergency back-up sights if the RDS happens to go down while shooting.
 

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Discussion Starter · #13 ·
So you just like this set-up better, and it works for you? There wasn't any specific problem with having an offset red dot?
I wasn't able to zero the offset RDS the way I wanted, so there was a problem with the offset.
 

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If you can't find an offset mount that lies directly above and 90 degrees to the bore when its raised above the bore it can be almost impossible to get a true zero for trajectory over any other distances. Most offset mounts are designed to align with known rail setups that are clocked for the AR platform, and they just may not work as well with a Sub2K with different rail heights.
 

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I mounted mine and used a level to check that it was aligned with the barrel. It seems right on, but I haven't had a chance to get to the range yet. Its very similar to an offset red dot I have as a close range backup on my AR10, and I've had very good luck with that set up.
 

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Discussion Starter · #17 · (Edited)
I did the best I could with my offset Aimpoint, but the set up really wasn't doing the gun justice.

The EOTech out front on the top rail is boringly dead center accurate... I like that.
It folds almost in half, and I can live with that.

I have experienced a few added benefits by mounting the EOTech all the way out front on the hand guard.

1. The added weight out front helps reduce muzzle flip.
2. Less of my view is blocked when looking AROUND the optic.
3. I enjoy enhanced accuracy at longer distances, the 1 MOA center dot helps.
4. It's even easier/faster for my eye to pick up & track the red dot looking through the large 'window' on the EOTech.

Your results may vary.
 

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