Six months ago I bought a Leupold Mark 4 3.5 - 10x FFP scope for my AR15. I bought Leupold Mark 4 super high steel rings since I have a DPMS flattop upper but I wasn't too happy with the weight of the rings ... a whopping 350 grams (12-1/2 oz)!! Recently I bought a pair of lightly used aluminum Leupold Mark 4 super high rings on Ebay weighing only 155 grams (5-1/2 oz). Since I didn't have to lap the steel rings, I hoped that the aluminum rings wouldn't need lapping either. I installed the lower half of the rings and torqued the nuts to 65 in-lb, then installed the 30mm Wheeler Engineering alignment bars with the top half of the rings and checked the alignment.
Side view - before lapping
Top view - before lapping ... WHOAA!!
Side view - after lapping
Top view - after lapping
Lower rings - after lapping
As you can see, the rings were WAY off, but after lapping the alignment was a lot better.
Side view - before lapping
Top view - before lapping ... WHOAA!!
Side view - after lapping
Top view - after lapping
Lower rings - after lapping
As you can see, the rings were WAY off, but after lapping the alignment was a lot better.
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