Tried out my Sentinel...

[ChiefBowman]

Seems OK. Accuracy was a little poor, and I busted 5 or 6 balls, with at least one being broken in the breech. I can't tell if it's the gun, or if it's the paintballs. My phantom shoots these balls fine, but that's because it's a phantom :D I'll see how it does when I get my Lapco Step Bore in the mail, and when I get some fresh paint up in this mofo. Trigger was pretty smooth, and I could rip off strings faster than other blowbacks I've owned. That's a plus.

[Ni-cD]

Accuracy is all about paint to barrel match. I'm not really sure what size the stock barrel is (anyone care to help?), but if that paint didn't match it, your accuracy would suck. Another thing that helps accuracy is a consistent velocity. Are you running co2 or hpa? Your Senti should run fine on co2, but it'll run even better on hpa.

As far as breaking balls...hmm...if it broke in the barrel, I wouldn't blame the marker. Breaking paint in the breech is a different story. I guess just try out some fresh paint like ya said. I've only broken two balls in mine thus far (both being in the barrel).

[plan9]

the barrel bore is .690

as far as the breech break i'd blame that on paint..what kind are ya usin

also make sure you've got the new style detents

[ChiefBowman]

New style detentes? What're those? Mine look like autococker style, with the ball bearings in them.

[Crash STP]

Bowman - a couple things;
sentinel truely need a revy or other motorized hopper to work well.
the bore size is 690/691.
you've got the new style detents w/ those.
Try some fresher paint. We've ( the team ) have run hellfire and evil w/ no problems that were'nt operator error.