If you've started shopping for an AR-10 or its parts, you've probably run into a wall of confusing terminology: DPMS, Armalite, LR-308, Gen 1, Gen 2, GII. Unlike the AR-15, which follows a widely accepted mil-spec standard, the AR-10 platform was never formally standardized. That means "AR-10" isn't really one rifle — it's a family of similar but not always interchangeable designs. Understanding the different types and generations is essential before you buy a rifle, order a part, or plan …