Alright, I'm just gonna say this.
In Unturned, it is implied that the low caliber military mags is the same ammo used in the M16, given that the eaglefire and maplestrike have a striking resemblance to the weapon.
And, personally, I absolutely despise any and all weapons that use their own custom magazines for the simple reason that it's far easier to carry a large quantity of the same mag, instead of having to organize a multitude of different mags.

So, I'd appreciate it if all guns that take the same ammo as the M16A4 could also take low caliber military mags.
Thanks.