Questar's RRA 9mm upper/lower combo... I got one!

Yep, just buffer and hammer are all that need to be changed in the lower. I do know that the magwell adapter can be a bit picky. Adjusting up or down a very tiny amount can make a huge difference in how it feeds. To remove it you undo the hex screw on the bottom of it and then just use the mag release. I have seen a notice about adjusting the magwell adapter to get things feeding properly with certain mags. Obviously it can't be adjusted too much because of the mag release but give that a try, the smallest amount makes a world of difference is what others have reported.

I haven't gotten to try mine yet, still waiting on magazines.
 
Are you having failure to eject or feed??

You can try moving your magwell adaptor up or down.

Is there a mangled empty case caught in the action while a live round is being stripped into the chamber?? I was having this problem. I noticed some brass markings on inside of the top of the ejection port. It looked to me as if the cases were being ejected too high and hitting the top of the ejection port and falling back into the action. I moved the magwell adaptor up which is attached to the ejector. This will lower the angle of ejection more inline with the ejection port.

I also found 147 gn Win white box worked best. Amer Eagle and anything 115gn was sh*t.

Gas Can
 
Gas Can said:
Are you having failure to eject or feed??
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It seems to be a failure to eject, as far as I can tell.

The spent casings are either not hitting the ejector hard enough, or not at the proper angle, or something.

I got the note from Questar about the 10 round C-Products mags as well. That is one of the things we`re going to look at next weekend. Colin is going to bring his (working) 9mm AR-15, and we are going to compare them, piece-by-piece to try and figure out what the problem is.

Beyond that, I can get it to Dlask early in the New Year.

P.S. - we`ve tried various 115gr., 124, 147 and even +P ammo... makes no difference.
 
I just got the same set up from Questar.
I have not tried it yet and probably wont for awhile as we just got another dumping of snow:mad:
I hope you can solve that problem and hope mine will function also.
 
ghostie said:
It seems to be a failure to eject, as far as I can tell.

The spent casings are either not hitting the ejector hard enough, or not at the proper angle, or something.

I got the note from Questar about the 10 round C-Products mags as well. That is one of the things we`re going to look at next weekend. Colin is going to bring his (working) 9mm AR-15, and we are going to compare them, piece-by-piece to try and figure out what the problem is.

Beyond that, I can get it to Dlask early in the New Year.

P.S. - we`ve tried various 115gr., 124, 147 and even +P ammo... makes no difference.
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I have set a couple of 9mm and the only thing finicky with using the C-Products and the RRA is the adjustment of the mag block

This is clearly stated on C-Products web site

The symptom however is a failure to feed not failure to eject. The only time you see a failure to eject is the ejector on the mag block is loose. You need to check that

From your pic it looks like you have a RRA or C-Products block. I personally prefer the Hahn blocks ( nowhere near finicky on positon ) but you should be able to get it to run ok with any block

I would first make sure that the bolt ( technically not called the carrier anymore ) is lubed properly. If that is ok , put in the 5.56 buffer and try it out

Since this is a blowback gun, you do need the extra weight of the 9mm buffer, but it seem like you might not be cycling back far enough so throwing the 5.56 buffer would be a quick test

Here is another test, load one in the pipe, and insert empty mag. Fire gun. See if it locks back on empty mag. When my 9mm AR gets dirty and starts running sluggish this is the first symptom

Lastly, check your extractor. Take the bolt out and hold it facing up. Push straight down a 9mm case or loaded round. It should click in very easily. With ZERO or very little effort you should be able to flick the case off in the direction towards the extractor.

BTW - if you don't want to run the 9mm hammer in your lower you can always get your bolt ramped so you can run it with any lower. I run 3 lowers with RRA 2 stage, Chip McCormick and Giessele all with the same 9mm upper

It also is more gentle on your hammer pin

Do you ever go to DVC Ventures indoor range in PoCo. I can meet you there and get it running
 
Ghostie, hope that you are able to fix the problem soon.

If you are still having problems, I can let you use one of my .223 uppers for some time until you have yours repaired and working. It sucks to have a new gun and can't shoot it.......
 
Well i had a chance to get out and try mine:confused:
So i am pretty well getting the same problem that Ghostie is having.
What is happening to mine is the mags fall out after the first shot.If i hold the mag underneath with my hand the first round fires but the empty brass getts caught up with th next round.What i have noticed is the mag catch seems like it is not far enough out to hold the mag.Now when i push on the outside of mag catch it holds the mag in place and seems to fire every round.Now this only works with one mag that i filed on both sides as suggested by Questar if the mags did not drop free.The other 2 mags i did not file down and they will not drop free or work properly.I will file them down and give them a try later.
So i think my problem is with the mag catch.Any ideas on how to fix this problem?As like Ghostie i dont know much about ARs and dont have the patience to work on them.
I guess i will phone Questar after the hollidays and see what they suggest.
 
Anyone that has an issue with their RRA ARs and RRA magazines should contact Questar directly about the problem. I had what ended up to be a minor problem once with a 9mm AR, and the troubleshooting was quick, and resolution process painless.

pc9 said:
Well i had a chance to get out and try mine:confused:
So i am pretty well getting the same problem that Ghostie is having.
What is happening to mine is the mags fall out after the first shot.If i hold the mag underneath with my hand the first round fires but the empty brass getts caught up with th next round.What i have noticed is the mag catch seems like it is not far enough out to hold the mag.Now when i push on the outside of mag catch it holds the mag in place and seems to fire every round.Now this only works with one mag that i filed on both sides as suggested by Questar if the mags did not drop free.The other 2 mags i did not file down and they will not drop free or work properly.I will file them down and give them a try later.
So i think my problem is with the mag catch.Any ideas on how to fix this problem?As like Ghostie i dont know much about ARs and dont have the patience to work on them.
I guess i will phone Questar after the hollidays and see what they suggest.
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I received my 10 round mag from Questar today - it happily falls out the same as yours pc9. No way it will ever stay in when firing a round, it will fall out if I tap the gun. Its pretty easy to understand why when you run your finger into the magwell, there is very little sticking out to hold the mag in place. I pulled my Mag Catch assembly off to see how it all works. The only solution I can see would be to put a bend in the mag catch arm. I don't think its going to bend easily and I'm not looking forward to having to do that. btw my mag isn't tight in the mag well at all. I have a RRA lower with RRA magwell.
Maybe someone makes a mag catch with a longer button to hold the mag in place better?


I also received my flip up front/rear sites from Questar today and they look great on my 7.5inch AR, also mounted a Surefire.


*edit*

I removed the magazine catch, dremeled it a little and then gave it a tap with a small hammer. It seems to have bent the rivet holding the post to the arm ever so slightly, mag is locked in tight now, I'll have to see how well it works long term of course.
 
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I would be hesitant in bending the mag catch. It looks to be cast Not sure better to be safe then it break. The Problem is the adapter that is in the mag well takes away a few thou of material from where the mags catch is. making the mag catch to shallow. I think this might be an over see by the manufacturer. There is not enough of the catch sticking out to secure the mag. Solution thicker mag catch. I am not sure you can even remove material from the adapter itself the mag would sit to loose in the well. Nope What I saw today screams custom part. being a bigger mag catch.
 
jsullivan said:
Just to confirm....

Can you pop a .223/5.56 upper on there (obviously removing the magwell block) using the 9mm hammer & buffer? Or do you have to remove the 9mm hammer & buffer and replace it with the .223 versions?

I believe you can not use a 9mm upper with a .223 hammer.

I have a 10.5" 9mm upper that I bought but it has been sitting around for ages, never used. I'm trying to decide if I want to keep it, or sell it off and get a .22LR upper instead for the ultra cheap plinking.
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If you're really searching for somewhere to put it, I'll take care of it for ya. ;)
 
Frozen Snake said:
I would be hesitant in bending the mag catch. It looks to be cast Not sure better to be safe then it break. The Problem is the adapter that is in the mag well takes away a few thou of material from where the mags catch is. making the mag catch to shallow. I think this might be an over see by the manufacturer. There is not enough of the catch sticking out to secure the mag. Solution thicker mag catch. I am not sure you can even remove material from the adapter itself the mag would sit to loose in the well. Nope What I saw today screams custom part. being a bigger mag catch.
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The arm itself didn't want to bend, thats for sure. A custom mag catch would be the ultimate solution. If you're really good with a dremel you can shave down the back side of the mag catch so it will side lower into the frame. There are no issues with that mod except its not easy to grind it down evenly and to not shave too much of the post off by mistake.
Not sure how easy it is to get but the mag catch is less then 10 dollars so I can afford to experiment with it. At the moment its working perfect, only time will tell if it will stay working.

I think RRA should make a custom one with a deeper mag notch.
 
wow,, im really sorry to hear the problems you all have been having with your 9mm AR's . i would just like to post that . because of this . i am HIGHLY turned off. almost bought myself one for xmas.but wont be now. infact ive decided to avoid all RRA stuff completely. i dont have time like you guys to tinker with it. if it didnt work right out of the box. id be really mad forking out 1600+ dollars . and im sure im not the only one.
 
WolFF said:
wow,, im really sorry to hear the problems you all have been having with your 9mm AR's . i would just like to post that . because of this . i am HIGHLY turned off. almost bought myself one for xmas.but wont be now. infact ive decided to avoid all RRA stuff completely. i dont have time like you guys to tinker with it. if it didnt work right out of the box. id be really mad forking out 1600+ dollars . and im sure im not the only one.
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Well i dont have the time to fiddle with mine either.I paid good money for this gun and it should not be doing this.If there is a simple solution to this as a new longer mag catch than it would be great.I will wait and see what Mark suggests on how to fix this problem.
 
Paulinski said:
Nothing wrong with 9mm RRA. I don't like their mag blocks and use Hahn instead.
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X2million


There is nothing wrong with the RRA 9mm platform. Set up 2 that both ran perfect out of the box without tinkering

Never heard of anyone having problems with the Hahn blocks

The 99% of the battle of getting these running is the GOOD mag block. You get what you pay for. The Hahn is price but far better built than the RRA style

Check out the difference in the feed ramp of the two blocks. The first one is the RRA / C Products style ramp

RRABlockramp.jpg


The is a Hahn block. Notice the feed ramps. The mechanism that holds it in place is also better

Hahnblock2.jpg
 
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