Brownells offers a 12-ounce titanium BCG for about $300; compared to a standard AR-10 BCG, that’s roughly $50 more than many higher-end BCGs. The former features a lightweight extended latch, and the latter features Grade 5 titanium pawls. I selected a brake because the rifle is light and will kick more than you're average .308-chambered AR-10. To keep the rifle nimble, a lightweight compact, with a BDC reticle for drop was selected; the Trijicon 3x30 ACOG. But if lightweight is your goal, then this is the primo optic to get to round out a lightweight AR-10 in .308 Winchester.