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hi Robert, they're made from 24 gauge galvanised steel, with 1/4" locating thumb screws. the weight for a 12' shield is just over 1200 grams which is enough to offset such add ons as cameras etc up the viewing end. There is 2 problems with aluminium 1. the only decent threaded rivets will chemically react with the aluminium over time and it will deteriorate 2. joining the tube once it is rolled, welding is almost impossible because of the thickness and pop riveting just looks terrible and if you can find the size you want in a solid tube it will cost a fortune, l researched a few ways to do these and found the gal the only real option especially if you want a professional finish. The scope rail is also home made.
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