One of these came through the gunshop I work at today and I figured I'd tell you guys my thoughts on it. First the differences between it and the normal Glock 21:
1. Glock 21 SF has ambi mag release (nice)
2. Glock 21 SF has new rail format (don't see why its necessary, but ok)
3. Slimmer frame
The first two are OK features, but my main problem was with the third. I'm not sure what dictionary the good people at Glock were using when they looked up the definition of slim or small (or whatever the "S" in "SF" stands for), but they obviously have no concept of what it means to re-design a handgun. It is just as big and clunky as the 21. Now, I'm a Glock man, so don't confuse this post with one written by someone who hates Glocks, but don't slap an "SF" on a gun and two new features and call in great. My boss told me that the rep at SHOT show was so very excited about their new glock, but people, come on!!! If you get a chance to pick one up you'll probably say the same thing, that there is no noticeable difference in size. I was very excited to see how great a job Glock did on this one, but I was sorely disappointed.