Not that it helps you, but for informational purposes there are a few components that interchange between the ANM2 and the M37. The belt feed pawls, for example, while being different drawing numbers are functionally interchangeable. The springs for the ejector, feed pawl and feed lever plunger are all the same part, as well as that plunger. But as has been well stated by the guys above, the ANM2 is a very different animal, about 1/3 smaller and lighter than the full size .30 cal Brownings. The 1919 series began its use right after WWI, in the form of the Tank Gun. The ANM2 was designed to serve where two or three full size aircraft models were considered obsolete. The 1918, 1918M1 and 1919 Aircraft guns, which all shared the same basic components with the 1917/1919 ground guns, were all come and gone by about 1930 when the ANM2 was coming to life.