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When a Gun dies!!!

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I was just wondering if any one out there had worn a gun out. What type it was and caliber? Also does anyone keep an approximate idea of how many rounds you put thru a specific gun? Several years ago Ipurchased a Ruger 10/22 and a buddy purchased a Nylon 66. We put many thousands of rounds thru them and finally the 66 went boom for the last time. The bushings and rails were gone. The 10/22 is still tight. Ihave never done that with a pistol. What a about a 1911 45 with standard fmj ammo, How many rounds before it will need attention? Mike