I recently purchased a Gen 2 Glock 21 that is nearly 20 years old. The Glock looks great and appears to have been shot very little. I know of one upgrade since the Glock was manufactured - the trigger bar reads 4256 and the suggested upgrade is 4256-1. The 4256 trigger bars were replaced by the 4256-1 due to light primer strikes. However, this Glock shoots fine and I see no need to replace the trigger and trigger bar. On the other hand, the part is only $13. Besides the trigger and trigger bar, anything I should think about replacing, even though it shoots great?
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