Look at the split where the hammer is, inside is the valve striker, put some oil right on that area, and cock/release the hammer against your thumb a couple dozen times to work it in............. then see if it does tht same. 80% of the time this problem is a lube issue, yours might be different (my G19 is doing the same, only at games when I need it, at home it fires fine, is way more than just a lube issue.
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