BUIS adjustment maxed...still off target


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LooseGrouper
September 5, 2008, 10:12 AM
I need some suggestions for fixing the backup iron sights (currently the only sights) on my new AR-15. The rear sight adjustment is maxed out to the left, but it is still shooting 2-3 inches right at 50 yards.

The the front sight is rail-mounted, and the forearm is ever-so-slightly misalligned. A friend suggest that I loosen the screws and re-tighten in an alternating pattern to try and straighten it up. This makes me nervous. Knowing my track record, it seems like there's too much opportunity to make things worse, or cause new problems. My first thought was to use shims or spacers on the rail mounted front sight.

Here's my setup: Midwest Industries (MI) 12" freefloated rail, MI rail-mounted flip-up front sight, MI low profile flip up rear sight.

What say the experts? Adjust the forearm? Use shims (if so, where to get them)? Something I haven't thought of?

Thanks in advance.

LG

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mp510
September 5, 2008, 10:29 AM
If you can adjust the rail, that would probably be your best bet. That way, you be putting the front sight where it ought to be mechanically.

Tarvis
September 5, 2008, 10:42 AM
Judging by your screen name, I wouldn't worry about it.

On a more serious note,(;)), why is the forearm canted? Did you install it? If you did but you're nervous about fixing it, it's time to put the tools down and sloooowly back awaaaay.... Take it to a gunsmith and have it done right.

LooseGrouper
September 6, 2008, 12:51 AM
Sorry for the late replies. Loooong day at work.

To answer the question, no, I did not install it myself. I bought the upper assembled from RifleGear.

The forearm has 4 pairs of allen screws that seem simple enough to loosen and retighten. I'm just not sure if it would actually help or not.

When I say that the forearm is very slightly misaligned, I mean about 1/8 of an inch. I wouldn't have been able to tell if the forearm had been open ended instead of having an end cap.

Tarvis
September 6, 2008, 01:01 AM
Let me get this straight, you have a flat top upper with a 4 rail free float hand guard, and it was not installed properly by the manufacturer/dealer? Call them and tell them you're pissed. Sounds like a good reason to not buy discount uppers.

briansmithwins
September 6, 2008, 10:34 AM
very slightly misaligned, I mean about 1/8 of an inch.

You know what the problem is. Send it back and get it fixed right. BSW

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