Black Rifle Design Tactical

Just a quick rundown on the shockwave blade AR pistol stabilizer along with the KAK shockwave tube.
Simply put, this is the best option for someone who wants a SBR without paying the $200 tax stamp.
What is even more important to someone like me (I live incredibly close to two other states and work out of state) is the ability to throw my AR pistol in my car and travel with it just like I can with my handgun. Instead of trying to get permission from the ATF.
The blade is simple, strong, and solid (unlike its floppy eared competitor). The KAK tube has 12 set screw dimples already machined into it to adjust the length of pull. Once you have the blade where you want it and you torque down that set screw, the shockwave blade is not going anywhere. This setup uses standard springs, buffers, castle nuts, and retaining plates. Price is great as well. About $50 for the blade and around $20 for the KAK shockwave tube.
Go check them out at:

www.shockwavetechnologies.com