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Old November 23, 2012, 07:42 AM   #53
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Join Date: May 17, 2004
Location: NC Piedmont/Foothills
Posts: 638

That goes straight to the heart of the interchangeability issue. Colt and probably all others have proprietary specs so after market replacements can go either way that is if they fit at all.
Well...No, not really. Specs are specs. Since there's no such thing as a perfect dimension, everything must have a tolerance. The interchangeability or lack thereof would be determined more by plus/minus tolerances and tolerance stacking in the parts group.

Sometimes tolerances stack in our favor, and sometimes they stack up against us. All parts involved can be individually within spec, but the stacking can result in the group being slightly out of spec. This is why you find the odd Series 80 system that's a little slow on the uptake...and why Colt produces different plunger levers to compensate when it's discovered. The majority work just fine.
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