Just got my G17 back from Smyrna for the second time after repeated FTfeeds from slide not cycling properly and it has the new 02-4 RSA. First time out at the range and no FTF's. This is huge because I had consistent FTF's prior. Here is what I can see is different with the 02-4 RSA which led me to notice what may have been the problem all along. If I look at the metal retainer cap for the inner spring near the muzzle end of an 02-1. It is just a flat metal piece and mine is all bent and distorted from the outer spring catching on it during the compression of the spring when the slide initially moves back. I hadn't noticed this before. This binding could have easily been causing the slide not to cycle properly. The new 02-4 RSA has a larger, encapsulated retainer for the inner spring.