XM177/E1/E2 5.56mm Submachine Gun
GAU-5/A and GAU-5A/A 5.56mm Submachine Gun
- 5.56-mm Submachine Gun, XM177E2 Army Materiel Command. June 1968.
- Final Report on the Product Improvement Test of Submachine Gun, 5.56mm, XM177E2. By George Hendricks and Allan Wilson. Aberdeen Proving Ground. June 1968.
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