We've done a short run of the bodies so we haven't yet re-anno'd any of them, but they have taken the initial anno just fine. Pricing will be released later this week and we are aiming for a price point that will make having a lightweight body more affordable. The weight is comparable to ULE bodies, when we weighed the two side by side the scale registered a 0.1 oz difference (ours being the heavier of the two). The bodies include a stainless steel spring buffer and stainless steel front frame screw lug.
As far as expanding a Mag line of parts - this product, in addition to several of our other products, was produced in response to customer requests. As long as we continue to get requests from customers, we will continue to expand our product offerings.