I'm not sure when the original Bushmaster Dissipator was introduced but I purchased Bushmaster Dissipator 2nd hand in '97 or '98, and it was a "post ban". No flash hider. It did however have a carbine length gas system, hidden underneath a full length handguard. Very similar setup to those Shaw barrels pictured. That was my first AR-type rifle of any sort. I was so impressed that when a buddy needed cash for his "pre ban" Colt green label HBAR I jumped at the offer. That's the Colt representative that forever soured me on Colt as a viable modern brand.