I almost got my thumbnail torn off with the stock carrier. I understand that if I loaded slowly and carefully, it wouldn't be a problem. But just in practicing faster loads, I almost got it torn off. It took me 5 minutes to install the new C-Rums carrier, which was surprisingly easy to install. The only 2 springs that should be removed aside are the hammer and carrier springs, which are easy to disassemble.
I noticed that with my C-Rums lifter, the front was already bent downwards and is short enough to clear the follower. I am still leery about loading fast because of my painful experience with the stock lifter - but it seems to work very well. It loaded all of my metal A-Zoom snap caps manually, and I still have to test everything out at the range.