I hope not to spark the whole 'cops guns vs rebels guns' thread when I say this...
But my view on the matter - If you nerf the rubber bullets for cops; then nerf the 7.62's for rebels.
Use the SW to your advantage. Shoot from distance, most cops won't have a chance from 600m as long as you use your gun wisely. I believe you can pick up a 7.62 MK14 for £160k.
To get a 7.62 rifle in the cops, you need to wither be in AR, or be an SI+.