35 degree locking block more gassy
I don't know if it's actually the different block, or maybe the environmental conditions at the range today. But I took the 35 degree out on its maiden run, and holy hell did I get gassed out on high strings of fire. Never noticed that before.
But on a good note, the recoil was noticeably less jarring and also the turning the magazine spring 180 degrees front to back trick does seem to make the factory 20 rounders run reliably.