We have used them a couple of times at TTAC3..
They do add a twist to room breaching situations.
The key .. in my opinion is to keep them realistic.. Real bullet resistant shields are heavy.. and not easily managed without training.
Any shield should be constructed so as to have the attributes of a real one.
I think that having replaceable panels that are "resistant" to bbs but can be penetrated with follow up shots to the same area are important.
If you create something that behaves like a real sheild .. you have no need to surround it with rules.
Rules are for games.... and rules will be gamed...
Make the object behave as it should and the rules of reality will prevail.
CAPS Range Officer
Toronto Downtown Age Verifier
If the tongue could cut as the sword does, the dead would be infinite