They'd light-weight barrels and also the ammunition fed only through the left side. Support trials lifted uncertainties about whether the guns would be suitable for aircraft or for anti-plane use. A weighty barrel M1921 was regarded as for ground vehicles.[22] The BAR is produced with aluminum alloy or metal receivers, https://single-bookmark.com/story16903427/the-smart-trick-of-browning-firearms-that-no-one-is-discussing