Okay I already have a nice sbr and just picked up a CZ scorpion Evo 3. After shooting it it is screaming 4 another tax stamp. I know about the 922 R compliance but my question is where do I have it engraved at as it's all polymer? Anyone else have this problem? I was looking at the Kriss Vector in scene the same thing. A mpx was another option but the Scorpion was a heck of a lot more price persuasive. Thanks in advance for any help, Glocktoys