Compact, dual magazine tubes, built in light. The full package deal.

Last time I posted, I had a crack going through my ST50; I listened to you guys and reached out to Stuff and Things. They gave me a replacement housing. My new problem. I reconfigured my p50 back to normal and added a vert grip at an angle and now…
I can’t decide which set up I like more. What say ye?

First range trip with my new SUB2000 Gen 3. About 50 rounds through it. It ran fine for the first couple mags, i think....then I started getting failures where the spent casing stayed in the action/chamber and I had to manually clear it. Happened around 3–4 times total. I was using FN SS197SR Has anyone else experienced this on a new SUB2000? Does it just need a break-in and lubrication, or should I be concerned?