I recently bought a glock 19 gen 4 with a test date of 12-30-2011. I've put about 350 rounds through it. It has the 0-4-3 spring. Ive been shooting Winchester white box and getting 3-4 cartridges in my face/eyes per mag. 2-3 failures to feed. Pretty frustrating. Called glock and they said I had all the latest parts. Wish I had gotten gen 3 now. Disappointed.
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