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Posted: 12/27/2008 9:11:24 AM EDT
| Just sighted an ARMS #38 STD in at 50 yards, using the small or target aperture. The actual sight itself is a #40. Had good groups until I switched to the combat aperture and it shot about a foot low at 25 yards. Any ideas what the problem could be? |
The ARMS 40 comes in several variations. One comes with same plain apertures, yours probably does not. I would suggest rezeroing with the A2 sight. Since the regular # 40 has a chopped off small 300-600 meter aperture I would say this is the reason for the foot difference in elevation-to compensate move the front sight up about 24 clicks with a sight tool(for 100 yard zero). Actually I would start with 12 clicks and add more clicks until you are centered. I would use a 100 yard zero and keep to it. Every time you cut or increase yardage you change the zero-keep in mind a bullet travels ina an arc at 25-50 yards a 5.56 round is at it's zenith of the arc. 100 yards flattens that ARC out. Start with a 200 yard NRA Target and zero from there.
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