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Posted: 11/2/2010 5:30:13 AM EDT
Go easy on me. I'm decidedly low-speed and high-drag.  On one AR that I've cobbed together from used EE parts, I'm getting disappointing groups. The scope I have on it is a cheap-ass "Leapers" rubber coated deal I got at a gunshow in probably 1995 for $20 or so. I've got it mounted on rings, and one ring is on the flat-top upper and the other ring is on the MI free-float rail (at least I think it's MI make, I'm not looking at it right now). First time shooting I got nice groups with this setup but then it took a ride in the deuce and the point of impact shifted WAY left. So I adjusted the crosshairs with the screw dials and brought it back to the correct zero, but it's not grouping near as nice as it did before. The way I see it either the MI rail is loose (it doesn't FEEL loose) and it's shifting a little with every shot, or the scope is just cheap garbage, or maybe it's just a really bad idea to have your rings on two separate rails like this and I should have never mounted it that way. Where would you start? |
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Not far, the front ring is near the rear of the rail. I only moved it forward to get a comfortable eye relief and easy access to the charging handle. Gosh, I don't have exact measurements but first time shooting this setup I was getting groups inside 1" at 100 yards and now I'm getting like 2"+ groups at 80 yards. To be fair that more recent shooting was less-than-ideal conditions with sun in our eyes and hard to get a good picture through the scope, but dang a scoped rifle with a 20" bbl ought to do better than that. Just to make sure it wasn't the shooter I got my prairie dog rifle out at the same time and put 5 rounds through one jagged hole at the same distance. That one has a Leupold mounted on the flat-top. Plus with the "bad" rifle I was shooting prone with a grip-pod (hard to get my head low enough, not much height on that bipod) vs. the "good" rifle has one of those great big harris bipods and I was sitting indian-style with it. |
| glare can be a bitch....hence the better performance with the coated glass/leupy. there shouldn't be much flex back by the lock ring. and if you were grouping before with the same set up its gotta be the conditions. it is "grouping" right? not random patterns? high left then low right etc. In my experience when a scope's internals take a dump they get very erratic. |
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