How to Fix Colt 9mm Carbine Ejection Issues

How to Fix Colt 9mm Carbine Ejection Issues

Gus Norcross, originally trained on National Match rifles and pistols by the National Guard Marksmanship Training Unit, specializes in Garands, M14s and 1911s at his small shop on the coast of Maine. His website is www.angusarms.com. He will be offering gunsmithing tips and tricks on Fridays.


The Colt 9mm carbine is a simple blowback design with no gas system or locking lugs. Theoretically, not much can go wrong. Rather than designing a whole new type of lower receiver, Colt adapted 9mm magazines to a 5.56mm mag well with a roll-pinned adapter. The ejector is a sheet metal prong installed in this adapter. Occasional ejection problems can arise when the ejector becomes bent outward so ejected cases don't impact on the ejector face correctly as they are extracted from the chamber.

This is an easy problem to solve. Grab the ejector with a pair of pliers and adjust it inward toward the bore centerline slightly. A slot in the bottom of the bolt provides clearance for the ejector and if you bend it inward too far it will rub. Check to make sure there is no contact with the bolt by hand cycling the action while observing the bolt face or by viewing through the mag well.

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