Lowering the drop rate does not equate to being rare. How am I still getting lots of rare weapons & engrams? What the hell are you doing that you're not? Do daily bounties, boom weapon parts! Do strikes, boom weapon parts! Do Court of Oryx, boom weapon parts! Do POEs, boom weapon parts! Do patrols on the Dreadnaught, boom weapon parts! If you don't have enough, that's your own fault. Because I'm upgrading new weapons every day and I'm still finding more weapon parts than I can use.