That they had lightweight barrels and also the ammunition fed only through the remaining aspect. Service trials raised uncertainties about whether the guns can be suitable for aircraft or for anti-plane use. A hefty barrel M1921 was regarded for ground autos.[22] The GAU-eighteen/A is a lightweight variant on the M2/M3 https://listfav.com/story18139053/5-simple-statements-about-browning-rifles-explained