If you are running a classical Superspy game, your agents will probably not requisition these weapons.
However, I consider the contents worthwhile for two scenarios: One, if you are running a more military-themed game (and Spycraft's very much at home in crunchy, tactical combat), this will be pure gold for a near-future campaign. Two, if your spies are going up against high-tech masterminds, their minions will likely be packing some of these guns - a nice way to give them some serious firepower.
I would've added a more in-depth look at Land Warrior, but I guess that would be out of place in a pure weapons supplement. Recommended, overall.
[5 of 5 Stars!]