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Posted: 10/1/2004 8:12:48 AM EDT
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We have a customer that stated that switching a zeroed upper over to another lower changes the zero/point of impact. Obviously moving an upper from a tuned target lower to a stock lower will have an effect on accuracy, but this is not what the issue is. I was actually speechless for an answer and it seems very silly for me to have to ask for help on this subject, but from a business standpoint and trying to answer professionally without disrespecting or demeaning the individual, I do need some additional advise. TIA |
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I would ask him what other variables there where. Was the rifle originally sighted in lower/higher temps, is there an elevation/barometric change between the 2 days, was there a lot of wind that day, has the lot/type of ammunition changed, was he shooting off of a bipod/rest that caused barrel deflection, has he removed the optics or bumped the sights, can he swap back to the old one and the rifle shoot back to its original POI, and how much has he actually observed in POI shift? IDHunt |
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1. Have him send you the upper. 2. Rule out stupid problems like loose mounts. 3. Take digital video of you shooting groups with it with two or three different lowers. 4. If zero changes, figure out WTF is wrong, 'cause it seems like a mysery. 5. If zero doesn't change, burn video onto a DVD/CDROM and send him back the upper and the DVD. -z |
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I would like all the details on the two lowers. Like the others said, the stock lengths could play a part in it. I'd also want to know what triggers are in the two lowers; does one have a 2 stage or tuned trigger and the other a stock, OEM trigger? You are in a tight spot here because I think this guy is smoking crack but you don't want to go around pissing customers off if there really is a problem. |
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Any difference in the trigger or stock length may reveal deficiency in the shooter, not in the upper or any upper/lower interaction. What are physical effects the lower can make on the upper, while in battery? . upward force on the bolt carrier from the magazine / rounds in the magazine. . making sure the operating spring has enough tension put the rifle fully into battery .. any others? -z |
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