The pellet shells have a bigger ridge around the bottom which is why I think they stop the bb versions cylinder revolving.

I was able to compare the two models at the range last Saturday.

For can bashing at 10 m there is no real difference in accuracy.
The bbs seem to hit harder.

At longer ranges ,15/20 m the pellet version has the edge but bb one isn’t bad.

For 6 yard paper target the pellet groups better.

Both are good pistols in my view.

The 7 inch pellet Umarex Peacemakers out shoot them but they have a nice rifled barrel and are much more expensive.