Sorry, people. I'm not sacrificing power for "flash and bang". I'm trying to maximize my Carbine's efficiency, not minimize it. I want a 5.4 pound close quarter fighting implement, with as much effective power that I can safely wring from it (without battering the action to pieces, of course). Had I been a "tunnel rat" or someone confined spaces, such as a vehicle or helicopter, it would be an entirely different matter.
I want the ability to inflict as much damage against an aggressor as I possibly can. The .30 Carbine is an excellent "house gun" and is a prime candidate for suppressing neighborhood fighting or household intruders. With 5 30-round magazines, it shoud serve well in just such an emergency.
I really don't see the need for an SBR. $200.00 and a 9-12 month wait seem a steep price for a tool of such limited applications.
Is there a practical point to such an exercise?