Assault Rifle, as seen in Fallout 4. is radically different to those of previous games. Instead of taking any usual forms of either Kalashinikov designs (F1, F2, and 3 .. all are 'Chinese' design), FN FAL (Fallout 3.. there are TWO different designs of Assault Rifles, both uses the same 5.56 mm ammo), or.. Gene Stoner's design (NCR Service Rifle in Fallout New Vegas). Assault Rifle seen in Fallout 4 are much.. much bulky (and looks too unwieldy compared to its actual performances... the weapon designs are very WW1 to me.--side mounted magazine, and water cooled! and uses 5.56 mm ammo (and 30 round mag)! That's a crossbreeding between Browning M1917 and Benet-Mercie 'feedstrips' machineguns (Manufactured by the French, Italians, and Japanese arsenals) (or maybe Lewis too!). What's reasons behind this bulky designs and the uses of water cooling systems? hadn't this design outdated by 2077? or did the US Army has a different idea of multi purpose infantry weapons that could fulfill both the functions of service rifles and Squad Automatic Weapons ??