A while back I bought a new MP 9 L/E night sights 3 mags L/E SKU number , the gun has been flawless and had all updates , slide lock , barrel with two dots punched , the gun had a fact black PVD finish over the nitrate type finish . Who were they made for and what contract ? HUL36xx serial sku might be 151219 or 151215 any ideas ? Gun came from a L/E dist new in box like a over run.