I just took apart my latest build that used a Matrix handguard because of inconsistent accuracy. I found the barrel nut now fits the threads very sloppy, much worse than other barrel nuts I had to compare. I didn't torque it all that tight but think it expanded somehow. Seeing that, I can't recommend them, though I really liked the slim design. Kind of bummed about it actually. Hopefully it shoots a little better with a different tube.