My 1911 went to Jackboot's crusher back in 2003. Hated losing it, but in reality it was well and truly worn out. If I recall correctly I was using a "group gripper" set to extract the most accuracy out of it. The group gripper set (possibly a Wilson Combat product) was a recoil spring guide with a spring in the end together with a modified barrel link. The result was that the barrel was consistently forced into the locking lugs. Reliable and great for accuracy.