Re: G26 or G27?
I normally lean towards .40 because it gives me more options. For the more popular manufacturers/models (namely sig sauer, glock, springfield xd(m), and s&w m&p) there are a couple 3rd party barrel manufacturers that will offer a drop in conversion barrel from .40 to 9mm. For ~$150 you can have a gun that shoots more than one caliber. For my 4" .40 "Service" XD, I got a threaded efk firedragon 9mm conversion barrel so I could shoot suppressed. The existing 12 round .40 mags work, but I also picked up a couple 16 round 9mm mags....works flawlessly. I'll probably be doing the same for my s&w m&p 40 soon. I know storm lake makes conversion barrels for the m&p, I think they also make them for glocks.
During the ammo shortage, I was able to find .40 the majority of times whereas I couldn't find 9mm or .45. That goes for online as well as local shops (especially in the case of walmart). I've heard similar reports from the majority of other people I talk to, but YMMV.
That being said, the comments above about .40 being more snappy are spot on. I'm much quicker for follow up shots in 9mm....and you're obviously going to be able to hold more ammo with 9mm. The majority of tests with ballistics gel that I've seen haven't shown a big enough difference between the two calibers for me to say I must have one or the other. I personally have two carry guns, one the S&W M&P 40 and the other a Kel-tec pf9 9mm. I carry the M&P most of the time and the pf9 when I need something ultra slim and/or light.
Last edited by beanfield; 10-08-2010 at 10:01 AM.