Screwy RRA 9mm front sight

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[ARCHIVED THREAD] - Screwy RRA 9mm front sight

Posted: 11/16/2005 2:14:13 PM EDT

Just picked up a NOS RRA 9mm flattop upper, don't think it was ever fired. Put an ARMS 40 BUIS on it, and took it to work to sight it in. Without touching anything, it was about 10" low at 15 yards. I wound up screwing the front sight post almost all the way in until there was just aobut 3/16" of post visable. Then it was pretty close to POI.

Rock River says I might have bought a rifle rear sight instead of a carbine rear (!?!?!).

ARMS just asked which aperture I was using.

I'm gonna try a DPMS A2 detachable and see what happens, may try the Holosight off my Beretta Storm, too.

Any suggestions??

Steve

Posted: 11/16/2005 2:44:08 PM EDT

[#1]

If you are sticking with the ARMS, then get a taller front sight post from Bushmaster.

Posted: 11/17/2005 5:23:00 AM EDT

[#2]

Quoted:
If you are sticking with the ARMS, then get a taller front sight post from Bushmaster.

Getting a taller front post won't help him with his problem, if anythign he needs a shorter front post in order to bring the point of impact up.

As far as rifle sight over carbine, I have no idea as I use #40L on all my rifle/carbines.

Posted: 11/17/2005 5:45:33 AM EDT

[#3]

sounds like a real problem, got any pics of your set up?

Posted: 11/17/2005 9:57:48 AM EDT

[#4]

I've got a couple #40's. I don't think it matters if you put it on a carbine or a rifle.

Posted: 11/17/2005 11:32:46 AM EDT

[#5]

Quoted:
Quoted:
If you are sticking with the ARMS, then get a taller front sight post from Bushmaster.

Getting a taller front post won't help him with his problem, if anythign he needs a shorter front post in order to bring the point of impact up.

As far as rifle sight over carbine, I have no idea as I use #40L on all my rifle/carbines.

Sorry, I misread.

Try another rear sight.

Posted: 11/18/2005 7:50:33 AM EDT

[#6]

This is confusing me. I was unaware there would be any difference. I have a RRA midlenth 9mm flattop upper on order, and a MI flip up sight ready to go on it. Will I have a problem? Do I need a different front site post?

Posted: 11/18/2005 8:09:50 AM EDT

[#7]

this is the first i have heard about something like this, usually its the front post is too short but in your case its too tall

try posting this in the ar discussions thread and the rock river arms industry forum.

Posted: 11/18/2005 8:54:55 AM EDT

[#8]

Quoted:
this is the first i have heard about something like this, usually its the front post is too short but in your case its too tall

Steve conferred with me on this before posting. I suggested comparing his front sight post to one out of his .223, to make sure it wasn't out of spec. They were identical. I'm stumped, too, and as an armorer I'm very interested in how this issue is finally resolved.

In the meantime, I did the right thing, manned up and offered to buy his ARMS #40 cheap.

Posted: 11/18/2005 9:28:30 AM EDT

[#9]

Steve,
If you want us to take a look at it, we certainly would do so. Just call our sales department for a return authorization and we can try to figure out what's happening. FYI, the front sights posts and housings are the same height, but 9mm and 223 have different "flight paths", which will affect sight alignment. But, I don't know necessarily that that is what is occuring in your case.

We haven't had any real issues with the sights on 9mm uppers (they've been on the market for about four years) or rifles (just started doing them this year)...but different front/rear sight combinations may be causing gremlins to pop up.

Thanks.
Steve/RRA

Posted: 11/19/2005 4:41:10 PM EDT

[#10]

Thanks everyone, I appreciate the input.

I tried a detachable A2 rear today (much taller than the ARMS), and again the front post got bottomed out. I don't get it.

I'm going to try a couple more things, and then I may take you up on the return for inspection, Steve.

Steve

Posted: 12/14/2005 7:46:43 AM EDT

[#11]

I would like to thank Steve at RRA and Head armorer/production manager Terry Douglas for fixing my 9mm upper. They went above and beyond the call, IMO. It took a new barrel to cure the problem, and they had it in and out fast. I got it back and it worked slicker than when I sent it in, and the sights were right on.

Thanks a bunch, guys!

Steve

[ARCHIVED THREAD] - Screwy RRA 9mm front sight

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