I picked up a new RAMI decocker in 9mm about six or seven weeks ago. From the beginning, I'd been having anywhere from zero to three failures per box of ammo, where the slide would not go into battery, by approximately a half-inch or so. Most of the time the tap from a failure drill would be enough to pop the slide forward into full battery. I went through a lot of the suggestions in this and other jamming threads: full cleaning, different mags, exercising the extractor spring, polishing some of the friction areas, running it dry, running it wet, et cetera. Nothing seemed to fully cure it. Last week I went ahead and ordered the 18# Wolff springs. With a bit of cursing and some bruised thumbs I managed to get them installed properly (note bene: I'd suggest grabbing a helper for another set of hands when trying to get the retaining plate off and on). Since then I've run about 150 rounds through it, without a failure of any kind.
I picked up the RAMI with the intention of it being my carry gun, but I haven't felt comfortable with the number of failures I've been experiencing. I'm tentatively hopeful that the 18# springs have gotten me sorted out, tho. I have a lesson scheduled this Thursday so I should be putting another 150-200 rounds through it. I'll report back then.