Actually I tried, but didn't want to keep messing with it. Its kinda hard to get it just right. It's either a hair too big to hold in place, or a hair too small and it slips in and out and doesnt catch on the ears on the follower.
Yes it is. I had a G19 Taran basepad and that slipped on clicked into place effortlessly. Yeah I tried the screwdriver trick probably 50 times haha. The spring just pops out, even when I destroy my fingers getting it under the ears.