Exactly. The AR 15s weighed about the same, was about the same size and a 5.56 mm round has more of a punch than a 9 x 19 mm.
'Walk - watch and shoot ranges' - AKA 'sneaker ranges'.
Peter, I have a Pom Close Quarters Shooting Infantry
Training Pamphlet from circa 1961 - all of about 15 or 20 pages somewhere amongst my 'old junk' as the wife calls it that details the training, qualifications (SMG, SLR, LMG & GPMG) and how to build a sneaker range.