The "4340" stamp you are referring to is on the ejector.Hi new here and I came across a Old Post from 2016 talking about the Glock 21s with the stamp 4340 you need to change some parts ASAP so just wondering what parts I need to change or if anybody got some more info on the Glock 21 that stamps 4340 had a spring break on me just wondering if I should replace the spring $6 or get a whole trigger but I read changing the whole trigger requires some tuning to it View attachment 1113437 View attachment 1113439
From GLOCK Parts List, Will-Fit Info, & Order Form for Certified Armorers Only:
Glock Part# 8196 Ejector only - 10mm, .45 Auto, .45 GAP (marked 8196-2) replaces 4340-marked ejector - ref only / not for sale. Use 8203 Trigger Mechanism Housing
Glock Part #8203 Trigger Mechanism Housing w/ 8196-2 ejector installed - fits G20,G21,G29,G30,G30S,G36 (Excludes Gen4)
Reread @L.A.Tactical post #5 in the thread from 2016 that you refer to:
Do I need to "update" my Gen 2 Glock 21 (serial XL***)? | Glock Talk
If you are still concerned about replacing the Trigger Mechanism Housing as referenced above, give Glock a call or e-mail and ask them about the replacement.
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