Magpul 30rd EMAGS with caps. These have the witness windows on both sides and over-insertion stops. Most have not been used otherwise maybe loaded once. They've been sitting in a pelican case for years and out of stock everywhere.
Picture is representative of what they all look like. Sold in packs of 5 for $150 shipped (firm)
https://i.imgur.com/DSCJQTV.jpg
