Edited sentence: A more popular policy is being found in many units across the U.This has been fleshed out as a cost saving measure for both weapons purchase, easy of maintanence, ammuntion procurment, efficency, commonality among team operators, and the fact that more and more subjects/suspects are being encountered at either greater distances, more heavily armed, or with body armor.that SWAT units to do away with any and all submachine guns and use the long-rifle carbine as their primary/overall weapon for all engagements