Hank Strange posted a vid of them dumping 500 rounds through it with a SOCOM 762 can (K model I believe) and the blowback out of the locking mech for the can caused a hole to form in the polymer of the handguard at I believe the 6 oclock position of the barrel. I am actually interested in this rifle, but Kel Tec has a certain too many reputations, cheap, semi reliable, and half the time you can find their damn products because they are so slow to produce.