thanks for your very polite, informative reply! :-)
I had completely forgotten about obtaining replicas.
However, as I stated before, IMHO, there ARE a myriad of considerations, constraints, & restrictions - that even I - an engineer, having never taken one film class anywhere - realize that are perfectly understandable and FEASIBLE for not using the correct firearm replicas - and many other items: money, time, studio demands, & lack of concern by the director/ producers esp. when the accurate representation of those firearms are not germane to the storyline.
Acquiring replicas takes time & costs money to procure (instead of easily, quickly, cheaply using whatever's available from the prop room) plus every day of postponing/ extending a film shoot too costs money for salaries, equipment rental, etc. --> more costs = less profits....
At you own job, do you ALWAYS have sufficient time, manpower, equipment, & money (for other resources as needed) to accomplish your tasks 100% - or are you forced to often times take shortcuts?
If the former, then nothing would ever get done. I've never had the luxury of 100% resources in my jobs.... :-(
P.S. Love COMBAT! too!