Denny,
I don't know if it's a waste of time for a SWAT review, but there's a sophisticated mirror that works just like the sight reviewed by L. Thompson.
ParaScope "delivers a new capability to the urban combat tactical environment for safely identifying and engaging targets." Suggested MSRP a mere $1,599.95.
I'll settle for the one in the magazine. Easy, light, won't cost as much as an AR itself.
Gary