TFB Reader Gregor emailed us these photos he took of a semi auto SIG SG552 with a short barrel.

The combination of the 8.9 inch barrel, Primary Arms TTO compensator and ordinary 55 grains .223 ammo produces a huge muzzle flash, accompanied by rays of hot particles. Much to the disgust of my shooting buddy, who usually complains after every CQB exercise about the heat and pressure of the SG552s muzzle blast.

The photos he sent me are amazing. I could not feature just one, so I am embedding two more below …