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Iron Sights for Ruger PC Carbine Chassis 19122

This is a discussion on Iron Sights for Ruger PC Carbine Chassis 19122 within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; So I'm looking to put some iron sights on my new rifle but I don't think Ruger thought there dimensions through. I called and asked ...


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Old February 19th, 2020, 12:14 PM   #1
 
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Iron Sights for Ruger PC Carbine Chassis 19122

So I'm looking to put some iron sights on my new rifle but I don't think Ruger thought there dimensions through. I called and asked what was recommended and they said to mount an Mlok Picatinny rail and then get a set of AR 15 flip up sights. The problem is you can't sight these in because the handguard mounted rail isn't the same height as the receiver rail and barrel mounted rail. The longest sight radius possible where you can mount iron sights is under 10". Does anyone have any thoughts or recommendations for iron sights on this rifle? 20200218_182718_1582146780819.jpg
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Old February 19th, 2020, 12:50 PM   #2
 
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I had the same problem with mine and haven’t spent the money to find a solution yet. I think I recall some people saying an Arisaka low profile mlok to Picatinny rail and then a low profile iron sight. And then could cut some of the sight off if Still needed to go lower with it.
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Old February 19th, 2020, 01:02 PM   #3
 
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The problem isn't that the sights themselves sit too high. It's that the front sight sits to high out of alignment. Then when you try to sight it in you can't get the front sight post to go low enough to properly zero the rifle. If they would have literally added just another 1/8 of an inch in height to the receiver and barrel mounted rail then you could use the sights perfectly. But no matter what sights you use they're not going to be perfectly aligned.
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Old February 19th, 2020, 01:05 PM   #4
 
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19122 iron sights

I used the Arisake low profile under the front sight. My height difference is on 0.035". About one turn of the front post. I'm using Diamond Head sights and they are 100% [ absolute ] co-witness with my red dot. My stock trigger measures about a 4.5 lb. Volquartsen has their 2.25 lb PCC trigger on e bay for $150.00. Due to arrive on Fri.
Slight blem. Normal price is $273.00.
Also added Tandenkross ext mag release.

Last edited by TANZER; February 19th, 2020 at 01:13 PM.
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Old February 19th, 2020, 01:08 PM   #5
 
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Rugerpc9_shooter after looking at that rail you mentioned that just might be the solution. Is there anything that you've seen that confirms that this rail will align perfectly with the receiver and barrel mounted rail?
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Old February 19th, 2020, 01:12 PM   #6
 
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Thanks TANZER. I'll see about ordering a 3 slot rail from them to put under my front sight. I'm assuming they make a quality product? I've never heard of them before.
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Old February 19th, 2020, 01:15 PM   #7
 
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With that mentioned rail, did the screws have to be shaved down so they don't touch the barrel? The ones for standard rails from Magpul come pretty close to touching on the inside of the barrel fluting.
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Old February 19th, 2020, 01:19 PM   #8
 
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19122 iron sights

Nope. It's close.
I can pull the PCC out of the safe and send pic's if you'd like.
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Old February 19th, 2020, 01:34 PM   #9
 
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I don't have the chassis model with the Ruger aluminum M-LOK hand guard. I do have a Midwest Industries aluminum M-LOK hand guard and ran into the same problem.

Before I forget to mention it, if anyone is considering using a Magpul MBUS polymer flip up rear sight on the Ruger PCC 9, don't. The height of the rail top above the receiver top provides insufficient clearance to allow the release lever on the Magpul sight to be pushed down enough to deploy the sight from its stowed position, or allow it to be stowed if up.

My impression based solely on looking at photos on the web is that the Ruger proprietary hand guard top sits a little lower relative to the receiver than the MI hand guard. At least I have not had any issues with clearance for M-LOK machine screws between the top inside surface of the hand guard and the barrel top as seems to be a problem with the Ruger hand guard. That should make the off set between the top of the Picatinny rail segment mounted at the front of the hand guard and the top of the Picatinny rail on the receiver somewhat less.

The Arisaka low profile Picatinny rail top sits .270" higher than the base which is significantly less than the same dimension on a standard Pic rail. In my case with the MI hand guard even with the Arisaka low profile rail, there was still enough offset between the front sight post of a flip-up AR type front sight and a flip-up AR type rear sight on the receiver rail that I had to trim 2 mm off the front sight post to allow a reasonable range of travel for the front sight post for zeroing but it did work. If the offset is less with your Ruger hand guard you probably won't have to resort to that.

Why did Ruger make the height of the receiver Pic rail so low and why did they recess it down into the top of the receiver? I suspect they did this to allow the shooter to see over the top of the receiver rail and achieve a good sight picture with the stock iron sights without having to mount front and rear iron sights that were too high.
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Old February 19th, 2020, 01:42 PM   #10
 
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Samson sells a rail that runs the length of the barrel. It bolts to the rear and front sight screws. You could put AR sights on it and co witness an optic. Might be a little front heavy.
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Old February 19th, 2020, 02:20 PM   #11
 
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19122 iron sights

In full disclosure I did have file away about 2/3 of my front post.
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Old February 19th, 2020, 06:30 PM   #12
 
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After doing some research I think I may have found a solution. I popped on the Magpul MBUS Pro LR Adjustable Sight onto my rifle and adjusted the rear sight as high as it would go. This allowed me to use the Magpul MBUS Pro Front sight with the sight post in its lowest setting but I had no room for adjustment. I did all this co witnessing my red dot sight. But the Magpul LR rear sight with its elevation adjustment in conjuction with the Agisaka low profile rail should just about allow a full range of adjustment without having to grind down the front sight post. I really appreciate all the help you guys provided. When I get it put together I'll send some pictures.
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Old March 12th, 2020, 03:51 PM   #13
 
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So I can confirm after buying the Arisaka low profile rail it didn't get the sight low enough on its own. But when I use the Magpul MBUS Pro LR rear sight and adjusted the height as far up as it would go, I was able to co-witness my red dot with my iron sights. I didn't have to shave down the front sight post and had the full range of adjustment. I was able to get the Magpul sight from grabagun.com and got it for $88 by clicking their Grabaquote button. Attached are some pics of the sights and it co-witnessed. Thanks for the help you guys provided. 20200312_183858_1584057051459.jpg
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File Type: jpg 20200312_183928_1584057064925.jpg (2.77 MB, 12 views)
File Type: jpg 20200312_184031_1584057084460.jpg (3.87 MB, 12 views)
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