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Posted: 8/17/2008 11:11:27 AM
Awesome!! This really did the trick for me. Thanks for the post, otherwise I really would have been frustrated trying to troubleshoot the fit! |
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Posted: 8/18/2008 10:49:16 PM
Mine fits tight too. I like the tight fit of the RRA upper/lowers.
I found that if you remove both pins, seperate the upper and the lower and then put the two parts back together, pushing the rear pin in first and then the front pin, No problem. |
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Posted: 11/28/2008 11:24:47 AM
My uncle bought a factory built RRA lower and factory built RRA upper at different times. He couldn't get the upper to close in the lower. We tried 4 different uppers, and it never locked up.
He sent the two assemblies to RRA. They replaced the entire lower assembly. |
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asltrfl
Member
Team Member
Joined: Nov 2003  AZ, USA
 Posts: 483 Feedback: 100% (32) Link To This Post |
Posted: 12/26/2008 11:21:00 PM
I love them like that, my favorite builds are Bushy uppers with RRA lowers, fit too tight, have to dremel the rear lug, but damn! you get a perfect tight fit with NO wobble.
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Posted: 3/28/2009 4:45:16 PM
My relative bought a factory built complete RRA lower. We tried ArmaLite, Bushmaster, Colt, DPMS, Eagle Arms (Coal Valley), Eagle Arms Div of ArmaLite, Rock River, & Smith and Wesson uppers on it. Nothing would fit.
He gave up and shipped it to the factory. Rock River sent a new lower with his LPK in it (he marked a few parts to see if the internals would come back). |
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viper5243
Over worked and Under paid Member
Team Member
Joined: Apr 2007 AK, USA
Posts: 1251 Feedback: 100% (111) Link To This Post |
Posted: 4/3/2009 11:57:37 PM
Im having the same problem. My worn A2 upper works fine, but the newer RRA and YHM uppers wont work. I can't send it back because it's been SBR'd
I have a bunch of different uppers so id rather fit the lower to the uppers then each upper to the lower. |
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Posted: 5/18/2009 12:32:12 AM
Yes I have that problem too with the RRA. At first I thought it was bc I have the stag upper with the RRA lower which doesnt complement each other until I did a little more research and it all came down to wiggle'in it in and smackin it. I believe rock river lowers are commercial if I'm not mistaken which is mass produced... all in all you might have gotten a bad lower and need to send it back in. good luck!
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Posted: 6/15/2009 10:34:27 PM
ditto
two new RRA lowers and my uppers (keyhole) very tight fight not enough I had to sand or grind away but when I push in the takedown pin I have to tap it in and then upon removeal I have to tap out and then slap the barrel to break apart the upper and lower.. tried the same uppers on a superior arms and dpms lowers and they both work perfectly. |
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Posted: 7/15/2009 12:06:14 PM
You guys rock you saved me from doing something stupid. I have a Noveske lower with a DPMS upper it wasn't even close to being able to push the pin in.
I took your advise and tapped the upper closed with a rubber mallet IT WORKED. I did it a couple of times and now it works perfectly. THANKS  |
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Posted: 11/21/2009 3:43:29 PM
My YHM upper was way too tight in my RRA lower. So I wound up with a Fulton upper on the RRA. No fitting required.
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Posted: 12/16/2009 4:25:10 AM
Originally Posted By SASNAK: I just bought a new RRA upper to go on my old RRA lower and i am having the problem with the pin. The upper closes but I have to use a punch to get the back pin to go into the opposite side. Should I ream the block hole a little or just let time wear it in? same here, my takedown pin is very tight. with the front pin in, the rear pin holes are not lined up perfectly (RRA lower with Spikes Tactical upper). working it in and out several times as well as getting YHM EZ takedown pins seem to help some. Probably will still need to use my delrin punch to start the rear pin for a little bit when taking out, but I think it is going to be ok (at least I hope so cause I'm just about to finisg this build and hope the rest of the lower is in spec). |
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Posted: 4/3/2010 2:42:38 PM
my RRA lower fits perfectly on my Stag upper. It was a tad bit tight at first, but i just had to put a tiny bit of oil on the pivot pin. now its GTG
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Posted: 4/28/2010 6:41:58 PM
I recently got a LMT MRP upper. I borrowed the RRA lower off from my Elite Comp rifle to test it out and could not get both pins to engage.
I could attach the front pin, but then not close the rear pin. I could attach the rear pin, and the front would not go. I did not find and tight fit issues at the rear upper lug, although I tried the "cycle it many times" thing. No luck. Then I noticed there are two small bumps on the upper. They are just aft of the front pin, on the bottom facing surface that mates up to the top of the lower. The top surface on my RRA lower does not have any receiving cuts for them and when I check the RRA upper, I do not see these bumps on it. I also have a RRA Coyote and had the exact same story. So I wanted to know if anyone had any feedback on this. I am planning on building up a new lower for the LMT upper at some point in the future. I had planned to use a new RRA lower since it is what I already own on a few other rifles. I figured I would not do any modifications at this point, at least until I got the actual lower I plan to use long term. Then if I needed to do any fitting work, I would think about lightly sanding down the bumps on the upper to get the two to fit. It does not look like it would take alot of material removal. Thoughts? As you can tell by now, this is a new thing for me... |
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Posted: 6/3/2010 12:32:15 AM
I too had that WTF over, when I tried to attach a factory completed Rock River lower to a factory completed upper from DoubleStar. I looked, scratched my head, thinking it was the DoubleStar's fault. When I build up my DoubleStar's lower - no problem mating up either the Rock River upper or DoubleStar upper.
I could understand the problem if it was a Rock River lower in the white - versus a finished off receiver from the factory. Makes me what to re-consider doing my next build on my current spare RR receiver without going to an RR upper. I just love the Rock River's two stage trigger - real sweet. No tune up / dremel was required for the Rock River upper / lower so I won't tweak a thing. Right now I am thinking I might just buy a Spike's Tac upper / lower pair for my next build....once I figure out what sort of build it would be. That way I can tell just how touchy the Rock River - or for that matter Double Star is with other parts. Brad - |
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Posted: 6/4/2010 11:32:08 PM
[Last Edit: 6/4/2010 11:34:53 PM by aggiefan72]
double post
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Posted: 6/4/2010 11:32:46 PM
After I installed my RRA half quad free float rail , it prevented the upper and lower from coming together. I just backed off the lock nut a bit and moved the rail toward the muzzle to give them more room to attach to each other and they fit fine. Make sure the rail is not doing what mine did.
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Knees_And_Elbows
Member
Team Member
Joined: Jul 2010 NY, USA
Posts: 25 Feedback: 100% (4) Link To This Post |
Posted: 9/18/2010 11:55:10 AM
Originally Posted By Powerslide91:
I recently got a LMT MRP upper. I borrowed the RRA lower off from my Elite Comp rifle to test it out and could not get both pins to engage. I could attach the front pin, but then not close the rear pin. I could attach the rear pin, and the front would not go. I did not find and tight fit issues at the rear upper lug, although I tried the "cycle it many times" thing. No luck. Then I noticed there are two small bumps on the upper. They are just aft of the front pin, on the bottom facing surface that mates up to the top of the lower. The top surface on my RRA lower does not have any receiving cuts for them and when I check the RRA upper, I do not see these bumps on it. I also have a RRA Coyote and had the exact same story. So I wanted to know if anyone had any feedback on this. I am planning on building up a new lower for the LMT upper at some point in the future. I had planned to use a new RRA lower since it is what I already own on a few other rifles. I figured I would not do any modifications at this point, at least until I got the actual lower I plan to use long term. Then if I needed to do any fitting work, I would think about lightly sanding down the bumps on the upper to get the two to fit. It does not look like it would take alot of material removal. Thoughts? As you can tell by now, this is a new thing for me... Same issue for me. the rear lug goes in and out of the lower fine, i just cant get the rear pin in due to the extra material on the front of the upper. The front will be completely tight and at the rear there is a slight gap which keeps the holes from lining up. i can do one pin or the other but not both without having to flip the rifle upside down and pressing as hard as i can against the flat top to start the rear pin. Once its started i still need a hammer to get it close and a punch and hammer to open it back up. |
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Posted: 10/5/2010 9:55:36 AM
MY SABRE DEFENSE LOWER AND DEL-TON UPPER, WENT TOGETHER LIKE BUTTER AND IS STILL VERY TIGHT!! "VERY NICE FIT"
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Posted: 12/26/2010 3:59:17 PM
I too purchased a RRA Lower, I tried 3 different uppers, from 3 different manufacterers; Bushmaster, Oly & Dpms none of them fit on my Rock River lower. However my AR-57 upper dropped onto the RR lower like it was custom made for it.
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Posted: 6/23/2011 10:04:08 PM
Also glad I found this thread. I was so frustrated last night when I received my brand spanking new precision honed JP Enterprises JP-15 upper and it would not mate with, or even court, my RRA-based lower. I had to beat it to death to get it together and then had to whack the front of the barrel on the carpeted floor to open it –– hope I haven't knocked my upper out of alignment. The takedown pin could only be coerced to fit with a mallet.
Before I go further, there are two important factors: 1 –– I have on order a new JP-15 matching lower that should be in a few weeks so that means I'm not about to start taking material off of the lug of a $1,300 upper. 2 –– I have had this RRA lower for more than a year and fired about 400 rounds through a 24-inch bull barrel RRA upper. It's a nice snug fit with the existing RRA upper but not anything like last night's ordeal with the JP. So there's no use shooting it and waiting for it to solve itself ... that ain't gonna happen. With that said, I have a new LMT 14.5 upper coming in any day that WILL have to be mated to that stubborn RRA lower. Unless someone has come up with a sure fire solution over the past few years, I am going to patiently take a small three-sided file or my Dremel tool to the back corners of that RRA lower and make it fit the LMT upper. Then it will be a round file in the takedown holes or sandpaper on the rear takedown pin for a complete fit. Snug is snug, and nice, but stubborn is stupid. Still, I will solve this problem ... for it is now a challenge. |
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Posted: 6/24/2011 6:12:29 PM
OK, so today I measured the width of the lug on the JP-15 upper and the opening of the RRA lower's rear end. The results varied widely on both parts but kept a constant of only about two-thousandths difference, with the lower being a tad wider.
So instead of removing material, I went with the "wang it on down" method and it worked after several, several, several tries. At first I had to keep tapping the end of the barrel on the carpeted floor to get the thing back open. Gradually, it got to where I could whack the barrel with my hand. Finally, it got down to just a sharp slap of my hand on mid-barrel. Instead of a fine mating, it was more like aggravated rape. The takedown pin is still stubborn but is working its way through better. Tonight I will take some JP Bore Compound and coat the lower receiver area of concern and the takedown pin and work them a little more, so as to get a smoother mating. It will be interesting to see if this process has opened the RRA lower enough to accept the new LMT upper when it comes in next week. Otherwise, I'll be wangin' it some more before taking sandpaper or a file to it...which I will do if necessary. |
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Posted: 7/11/2011 9:11:21 PM
[Last Edit: 7/11/2011 9:16:35 PM by jenamy]
If your AR is a carbine you probably have the receiver extension (buffer tube) screwed in one thread too far. Check on that before doing any cutting.
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Posted: 8/14/2011 10:19:35 PM
Holy mother of goodness
This is the exact question I was about to ask, I will go back and read the entire thread, but I just bought a 1400$ upper aac blackout and it will not fit on my RR Lower  |
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Posted: 4/23/2012 3:57:37 PM
I have the tactical operator 2, similar problem, except front take down pin. The rear pin is fine. The front pin will not slide into the upper without using a mallet or banging the hell out of it. If you want to to remove the front take down pin then you have to use a screw driver or something similar as a punch. This rifle was purchased in one piece assembled, new in box from factory. I emailed rock river and they sent me a new front take down pin free, but that isnt the problem. The upper slot simply wasnt fully machined and to the naked eye you can see it is rough and uneven. Oh well. Rifle still shoots like a champ.
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Posted: 7/8/2012 8:51:22 PM
Originally Posted By asltrfl:
I have built at least 20 beautiful AR's using Rock River lowers, they are GREAT! My first time, like you, pissed me off, I thought, "what the hell", but after careful consideration, I decided to lightly dremel the upper corners of the rear lug on the upper. Why the upper and not the lower, well, the upper receiver cost less than the lower, and after dremeling just a little at a time and then applying "aluminum black", you couldn't even tell any work was done at all, I had a better fit than any complete factory gun I have ever purchased, and boy do I love a "PERFECT", tight fitting upper and lower. My builds are a better fit than any Colt, Bushy, or ANY factory rifle I have ever purchased complete. Keep on making them that way Rock River!! Or you got a Rock River that was converted to a SBR lower by a C2. And found out after the transfer. I relieved my upper as well. The SBR is a little too valuable to hammer together. Personally, I think it is a little too tight.  |
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