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Hi Bryan and welcome. I went with Taylor Freelance on the magwell: - https://taylorfreelancestore.com/carver-magwell-glock-21-20-40-41-tactical-gen-4-black/ ------------------------------------- KKM Precision has threaded barrels: -- https://kkmprecision.com/product-category/glock/40/ --------- Cheers, stay safe and enjoy!

Hi Bryan, magwell is here >>> https://slrrifleworks.com/gen-4-g20-40-21-41-magwell-adapter . Or here >>> https://taylorfreelancestore.com/carver-magwell-glock-21-20-40-41-tactical-gen-3-black/ . Threaded barrel here >>> https://kkmprecision.com/product-category/glock/40/ . Stay safe & have a great day!