We have a winner.I think the "sealed primers" are snap-caps, at least from what I can see.
During some basic function checking with the snap caps, the gun was occasionally locking up because the bolt was failing to drop out of the way.
I took the grips and side plate off to see what was going on, it was very dry inside, and I also found a little twig inside...
I figured out the screw holding the bolt in the gun was loose, I tightened it up real quick and everything seems to function perfect now.
I had a few minutes this evening and fired 18 rounds at an old 2 liter bottle in my grandparents backyard.
Not a huge test, but I just wanted to make sure it fired.
At about seven yards I was able to hit the bottle every time, with three different brands of range ammo.
I also picked up 2 boxes of the Winchester W Defend ammo, but haven't had the chance to fire it yet.
I'm hoping to test that for accuracy and reliability this weekend.