I pick up my DW bobtail in a few days and I'd like to know this as well. I have shok-buffs in 5 of 6 fullsize models and they have never caused any issues, but I have never owned a commander sized 1911 before.
I tried buffs in: SW1911 [5"], GI build [5"] & Colt Combat Cmdr [all w/ FLGRs].
Used two types: brand [x] black & Wilson blue.
The black ones were softer and seemed to deform quickly and come apart, and I found pieces of them falling off in the GR channel.
The Wilson's held up much better, but still seemed get hammered a bit.
One suggestion a 1911 smith gave me:
"Make yourself a washer the same shape as the rear of the recoil spring guide with a hole in it and install in front of the buff so the buffer is sandwiched between the front of the guide and the washer. You should only need this to be about 40-50 thousands thick.
It seems that the worst thing is not using a heavy enough recoil spring. They want you to change the buffs after 1000 rounds and I think they don't even last that long."
The other problem I've had w/ buffs: in slide lock they seem to add a bit of vertical pressure on the barrel which results in you not being able to thumb the slide lock lever down. Only way to release the slide lock was to yank back the slide manually.
Some would say this is preferred/tactical way to do it anyway, and that's how I was taught in the Chuck Taylor 3 Day Hangun Course. But I've since gone to thumbing the slide release to speed up reloads in IDPA. It's just plain faster.
Shok buff's only work in full size 1911's,tried in my commander bobtail,slide would not go back far enough to engauge slide stop,talked to Gunsmith at Wilson Combat,said shok buffs will not work in commander's and compact's