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Posted: 9/6/2006 7:35:40 PM EDT
| I have a rock river 16" flat top upper with an ARMS #40 mounted I was zeroing at 25 yards. When I had the aperature centered in the arms 40 sight I was consistanly shooting groups 4-5 inches to the left. I had to max out the aperature all the way to the right in order for the groups to start touching the bullseye. I have never had any experience with the arms 40 sight but I don't think this should be the case, especially at 25 yards. My friend who also shot the rifle was having the same results. Is this normal or acceptable for a buis? If it is does anyone have any suggestions for a buis that I can get on target and still have room for possible adjustments? Possibly a fixed one? |
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Interesting...I didn't get a response from my initial question about this very subject. I thought it was taboo or something... Anyways, my ARMS BUIS mounted with a severe cant on my RRA upper. No issues with a DPMS or a LMT BUIS, nor with my eotech... Sent the ARMS back with my complaint. It was replaced no charge... The replacement mounts correctly. Regards.... |
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How old is your RRA upper? Several years ago RRA put out a batch of uppers that were out of spec. The ARMS could be canted. (Troy had a bad batch once too.) The FSB could be canted. The upper could be out of spec. If its a newer rifle then it will probably be the ARMS or the FSB. |
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I have an ARMS 40L on an Armalite. After much measuring and dinkin' around I discovered that it probably is the 40L (and not the receiver rail). It cants when you tighten the clamp. I shimmed it and reset the aperture to center. Went to the range and started shooting some 50 yard bulls-eyes with the aperture only a couple clicks off center. I haven't decided if I'm going to contact ARMS or just call it good. hinking.gif |
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