If you want some field reports, go to TFL and search "Norma" under username "Snowdog".
I had the "opportunity" to test a couple hundred of these rather extensively out of a G19, K9 and PT-99 a little over a year ago.
Essentially, they are cartridges featuring plastic bullets made by Norma with a 5mm iron ball embedded in the tip. They are made for training purposes, very loud, hopelessly inaccurate, deadly at close ranges and will not cycle any kind of auto that you're likely to have. In other words, it doesn't serve much of a purpose.
I still have around 500 rounds that I haven't any use for.
If I were to put in a very light recoil spring, it would theoretically work, right? If you're just out in a field, blasting stuff into a bank of dirt, and 864 rds costs $40+s&h, who cares if it's accurate?
Well, I suppose the trick would be to lighten the recoil spring, but to also leave enough "uumph" in the spring to allow the slide to strip a fresh round from the mag... too little tension, you'd get a cartridge refusing to leave the mag. Too much and you'd get a short cycle.
But, if the recoil spring were just right and magazine loaded under full capacity, I'm sure it'd work.
Then again, since they are just as loud as ball ammunition, less accurate and have a useful range of so many feet, you could just shell out the extra $30 for ball and save your springs.
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