in the full size guns, or they tend to not be very reliable. Just not enough recoil to move that big, heavy slide. I love the alloy commander in 9mm, tho. It is every bit as "hard" to control as the full size and wt GM in .45, so why waste 10c more per shot on .45 ammo?
I use a "chopped", Detonics length, Colt steel slide .22 unit, on an alloy framed 1911 and it's every bit as "hard" to control as a P35 Browning 9mm, so I save another 10c a shot that way. Instead of having to fire 15,000 rds a year of .45 to stay on top of my skills, I fire about 1000 rds of .45 (in an alloy Commander) 5000 9mm's, 10,000 .22's, and have considerably more fun at the range. $1000 a year, instead of $3000+. Not a bad savings. It more than paid for the "new" guns, mags, etc in the first year of owning them.