This problem was fixed as soon as I swapped in a Airsoft Surgeon BBU and Hard Piston. I also had to round off (file) on of the blowback unit legs, as it was catching on the disconnect lever at the most rearward position. Illusion said SD slides (and mine, a Davidson Custom, same idea, CNC'd aluminum) can be pulled back farther than other/stock slides so they can catch on the lever.
The gun cycles correctly with both of the outer barrels I have (stock TM 5.1 and Nineball metal 7.0) and the slide catches on every empty mag.
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