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Red dot co-witness ruger pc carbine

This is a discussion on Red dot co-witness ruger pc carbine within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; has anyone found a way to be able to get at least a 1/3 co-witness with the ruger pc carbine and a red dot? i'm ...


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Old April 16th, 2019, 12:03 PM   #1
 
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Red dot co-witness ruger pc carbine

has anyone found a way to be able to get at least a 1/3 co-witness with the ruger pc carbine and a red dot? i'm using a Sig Romeo 5 on the low mount and the front sight seems high enough but not the rear sight. If i use the hight mount, i can see the iron sights through the mount under the red dot but that is not ideal.



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Old April 16th, 2019, 01:39 PM   #2
 
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I started using an inexpensive red dot on the high mount and i’m Lovin’ it.
I can use the iron sights or the red dot by just an eye shift. Thursday will be a visit to the range with the PC9
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Old April 17th, 2019, 05:42 AM   #3
 
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Quote:
Originally Posted by vided View Post
I started using an inexpensive red dot on the high mount and iím Loviní it.
I can use the iron sights or the red dot by just an eye shift. Thursday will be a visit to the range with the PC9
so you are able to see the iron sights under the red dot through the mount? i noticed i was able to do that too i just didnt really like having the red dot that high.
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Old April 17th, 2019, 01:51 PM   #4
 
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For plinking and range time what would be the disadvantage to looking under the red dot?
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Old April 18th, 2019, 05:04 AM   #5
 
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Are you able to adjust the red dot elevation to give you the 1/3? I used an AT3 micro red dot w/low mount on my AR and just lined it up where it needed to be for 1/3.
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Old April 18th, 2019, 06:50 AM   #6
 
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Quote:
Originally Posted by vided View Post
For plinking and range time what would be the disadvantage to looking under the red dot?
Honestly i can make it work, i'm just not a huge fan of the way it positions my head with the high mount.
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Old April 18th, 2019, 06:51 AM   #7
 
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Quote:
Originally Posted by HamRadio View Post
Are you able to adjust the red dot elevation to give you the 1/3? I used an AT3 micro red dot w/low mount on my AR and just lined it up where it needed to be for 1/3.
my dot came with a "lower 1/3" mount but it still doesnt sit low enough to get a 1/3 co-witness with my stock back up sights. i can get the front sight but not the rear.
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Old April 18th, 2019, 09:22 AM   #8
 
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Risers for red dot sights that advertise themselves as providing an exact co-witness, or lower 1/3 co-witness are designed for the AR platform which positions the sights significantly higher above the bore axis. Just look at the height of a standard A2 front sight tower. The tip of the front sight post is around 2 3/4" above the bore axis.

The tip of the PCC 9 front sight post is around 7/8" above the bore axis. Now the Picatinny rail milled into the top of the PCC 9 receiver is a little closer to the barrel bore axis than it is for a flat top AR receiver, but not enough to make up for that difference in iron sight height. I doubt that you will find any red dot sight that will provide a reasonable co-witness with the iron sights on the PCC 9.
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Old April 18th, 2019, 09:47 AM   #9
 
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Originally Posted by pblanc View Post
Risers for red dot sights that advertise themselves as providing an exact co-witness, or lower 1/3 co-witness are designed for the AR platform which positions the sights significantly higher above the bore axis. Just look at the height of a standard A2 front sight tower. The tip of the front sight post is around 2 3/4" above the bore axis.

The tip of the PCC 9 front sight post is around 7/8" above the bore axis. Now the Picatinny rail milled into the top of the PCC 9 receiver is a little closer to the barrel bore axis than it is for a flat top AR receiver, but not enough to make up for that difference in iron sight height. I doubt that you will find any red dot sight that will provide a reasonable co-witness with the iron sights on the PCC 9.
Yeah that's what i figured. i'm planning on getting the midwest industries hand guard. I'm thinking i might take the factory backup sights off and just put some magpul mbus or similar on the new midwest hand guard.
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Old April 18th, 2019, 12:47 PM   #10
 
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Yeah that's what i figured. i'm planning on getting the midwest industries hand guard. I'm thinking i might take the factory backup sights off and just put some magpul mbus or similar on the new midwest hand guard.
That might work. In order to be able to properly align and zero the sights, they will need to be mounted at close to the same height above the barrel bore axis. Magpul MBUS, like most other flip-up AR type sights, are made to mount on a Picatinny rail. It is hard to be absolutely certain, but it looks as if the top of the Midwest Industries rail is just about the same level as the top of the PCC 9 receiver would be, without the integral Picatinny rail. That is good because to mount that type of front sight, you will need to install a short segment of M-LOK Picatinny rail onto the front of the hand guard for the sight to go on. You would like the top of that rail to be at the same level as the top of the rail on the receiver.

Of course, you can adjust for some degree of vertical misalignment by adjusting the height of the sight post on the front sight, but if the height difference between front and rear sights is too great, you won't be able to zero the sights. I would suggest that before you order a sight set, when you get the hand guard mounted attach the short Picatinny rail segment that comes with it to the front of the guard. Remove your stock rear sight (easy to do) and lay a straight edge on top of the M-LOK rail segment and the Picatinny rail on top of the receiver and see whether it is close to parallel to the barrel.
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Old April 18th, 2019, 08:12 PM   #11
 
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Quote:
Originally Posted by jburks View Post
has anyone found a way to be able to get at least a 1/3 co-witness with the ruger pc carbine and a red dot? i'm using a Sig Romeo 5 on the low mount and the front sight seems high enough but not the rear sight. If i use the hight mount, i can see the iron sights through the mount under the red dot but that is not ideal.
It can be done, with a little machining, but it's kind of a PITA.

20181006_151029_jpgprep.jpg

20181006_163811_jpgprep.jpg
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Old April 21st, 2019, 01:01 PM   #12
 
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I did a small experiment today and was a little surprised at the result. I took a Magpul MBUS Gen 2 polymer rear sight and tried it on the Picatinny rail on the Ruger PCC 9. It does not work well.

The Magpul MBUS has a levered polymer piece that is depressed to release the spring loaded sight body that contains the peeps. It must also be passively depressed when the sight is folded back down. The Pic rail on the top of the Ruger PCC 9 receiver does not extend very far up above the top of the receiver at the sides of the rail, so there is insufficient clearance for this lever to be depressed far enough to release the sight upward or fold it back down. The sight will work if it is mounted on the very rearward slot in the rail, leaving most of the body of the sight hanging off the back of the rail. Since the receiver slopes down behind the rail, there is sufficient clearance for the little lever arm to be depressed.

The sight looks rather stupid mounted that way, IMO, and seems more prone to be damaged. The MBUS could also be mounted with the sight already deployed up farther forward on the rail, but then it could not be folded down.

Interestingly, the rather similar polymer flip-up rear sight that comes on the Ruger AR 556 will work fine. The design is proprietary and has a different release mechanism. This sight has a release button on the left side only and only a single size peep aperture, unlike the Magpul MBUS which has release buttons on both sides, and two different diameter peeps.

The polymer Ruger AR 556 rear sight is designed to place the sight axis approx. 35 mm above the top of the Picatinny rail the same as the Magpul MBUS front and rear sights, so it should work fine with the Magpul MBUS front sight, so long as it could be mounted on a rail that was close to the same height above the bore axis. It could be mounted on any M-LOK Picatinny rail segment with three or more slots.

I suspect you could buy the AR 556 rear sight from Ruger but I haven't checked.
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Old April 23rd, 2019, 03:44 AM   #13
 
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I’m not sure it would be practical from a handling or damage tolerance standpoint but, having higher front/rear iron sight posts could easily provide co-witness, I have a PA Adv. Red Dot which is similar to most and even without the low riser base, it would be hard to see the rear sight. The front would end up looking more like an AR/AK front, height-wise.
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Old April 23rd, 2019, 04:02 AM   #14
 
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Just saw this on the Midwest industries Instagram page. I wonder what they have planned. The comment was referring to the low profile red dot mount that Midwest had on their Ruger PC carbine in the photo. I'm thinking they might have a new sight set in the works.

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Old April 23rd, 2019, 04:18 AM   #15
 
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Have you thought about a 45 degree mount?
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