There's not a ton written about this that I can find, but cracks are appearing in the US military's plan to replace the M4 with a heavier battle rifle designed to defeat body armor. Sig Sauer, which also holds contracts for the current generation pistol and LMG, won a contract last year to also provide the US military with a new rifle. This rifle is to be called the XM7. The civilian equivalent is the Sig Spear. Calling this thing an assault rifle is a bit of a stretch, as it is very heavy and uses heavy ammunition. It turns out that the rifle is failing to penetrate modern body armor without the use of tungsten bullets. Also its reliability is questionable.
Of course it’s bullshit: it was made by liberals. I would still recommend it just because it dramatizes that basic functionality and safety are subordinate to maintaining the system of expenditures in military R&D. The movie itself doesn’t question the need for a particular armament or what is given up to create it just that it took too long and cost too much to develop.