EITHER WAY, PSA AND SHIELD ARE PRETTY GOOD. MAGAZINE RELIABILITY IS ONLY ONE PART OF A SYSTEM'S OVERALL INTEGRITY AND EASILY MANAGED BY MAINTENANCE AND INSPECTION. IF IN DOUBT, PUT 1K ROUNDS THROUGH A COUPLE DIFFERENT MAGS AND RECORD HOW THEY DO. THAT'S ONLY LIKE 280K SATS FOR 9MM BALL, PRETTY GOOD DEAL FOR VALIDATING ONE'S LIFE SAVING SETUP.