You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "The 9mm German designed submachine gun used by OMEGA was developed in what decade?" whose answer is 1960s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: 9mm German designed submachine gun used by OMEGA
Useful Output:

Doc 1: The PM9 was an interesting an unique submachine gun designed by Louis Debuit for the French firm Merlin and Gerin (hence the MGD name – Merlin, Gerin, Debuit)
Doc 2: This MP5 clone loves round nose ammo and will eat it up all day long just hates the flat nosed stuff.
Doc 3: Made from a thick nylon, the case is right sized to fit the MP5 with good zippers, stout straps and carry handle, and external mag pouches. It
Doc 4: The Maschinenpistole 40, commonly known as the MP40, was first put into service in 1939 and stood out as a revolutionary submachine gun that dramatically
Doc 5: The Brügger & Thomet MP9 is a submachine gun chambered for the 9×19mm Parabellum cartridge that is designed and manufactured by Brügger & Thomet. MP9.