I just got back from my second range trip with the WK180C, first trip I used Colt steel cased ammo, functioned flawlessly, not accurate enough for my liking, but it works.
Today I fired 20 rounds of the Colt, and about 15 of this Federal, AR5.56 it is crazy hot, usually I check my brass after firing, but figured the lawyers had it covered, after firing 8 from the mag the second last jammed, the bullet, and case separated. So I had to drop the cleaning rod down the barrel to remove the bullet.
So my day ended early, if someone knows how to host pics now let me know. 90% of the primers were cratered, gas bypassed the primer and pocket, and HEAVY extractor Mark's.