I bet it was the Sig service reps that told them the Glock service life was four years. That's funny. Even if it was four years, most LEO's (not all) only fire their weapons once a year or every six months to qualify unless they fire it in the line of duty. My son-in- law's agency just now swapped their Glock 21's for new ones, after ten years. His old one was still going strong when they swapped them out.
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