I have a .40 rifle and just got a compensator for it. This thing goes over the tip of the barrel.

It slips on easily enough but I have a quesion...where it connects to the barrel it slides over...then it expands inside where the vents are...then it exits at the same diameter as the barrel, at least it looks the same.

Is there a chance that a bullet leaving the end of the barrel might get slightly off course and hit the end rather than go through the hole?

that would be bad right?

I have a .40 rifle and just got a compensator for it. This thing goes over the tip of the barrel.

It slips on easily enough but I have a quesion...where it connects to the barrel it slides over...then it expands inside where the vents are...then it exits at the same diameter as the barrel, at least it looks the same.

Is there a chance that a bullet leaving the end of the barrel might get slightly off course and hit the end rather than go through the hole?

that would be bad right?

It's funny you should ask this. I've just had that happen, recently! ;D

1.) I don't think the hole in the front of the compensator is actually .40". I have a spare one that I'm unsure if I'll put on, and it mentions that it's designed for both the 4095 and the 4595 (which, as far as I know doesn't exist yet, and judging by the naming convention, would probably be a .45 ACP). So, I think it's at least .45" I'll try to remember to get my calipers out and measure it for you when I get home.
2.) As long as the compensator is securely fastened to the barrel, the amount of deviance the bullet would have to undergo would be anything but "slight."

I.E. I'm pretty sure it's extremely unlikely under normal conditions.

So, to explain how it happened to me. The metal the compensator I used to have on the rifle was made of was really really cheap metal. I ended up tearing one of the tabs that you screw together when attaching the thing. I'm assuming (I didn't bother to retrieve it from the indoor range, as that would mean shutting down the range while someone went and got the thing for me) that tab finally broke off, and at some point, the compensator inched its way forward until it was far enough off straight that a bullet hit the side of that hole. I found a piece of lead with a bit of jacket attached to it embedded in my paper target when I took it down. When it came off, there wasn't any damage to the barrel, though there was a lot of powder residue, or something of that sort on the end of the barrel.
Prior to this, I'd probably fired a thousand rounds through it with the compensator on it, all the while expecting it to take off at any time (which is why I had a spare). It doesn't compensate an appreciable amount, and made cleaning it a little more difficult, so putting the new on one is not a priority.
My advice is to stick something in between the two tabs so you won't have the same problem I did.