The stock bushing is almost paper thin at the rear. We made ours slightly shorter but stiffer, resulting in more structural rigidity when compared to the OEM bushing. Stock bushing is not heat treated, CGW bushing is heat treated to RC 56-58.
CGW bushing is designed to be driven into the slide for a very snug fit, so there is -0- play within the slide. Bushing ID is critical, and we old this to .0005" (one half of one thousand) so when the slide is in battery, the barrel is locked into position, which results in virtually no play at the muzzle.