Colt 1911 MKIV Series 70 ejection problem?

I used to build 1911's.

Going to a heavier spring will not solves this problem - probably make it worse. Here - you would opt for a lighter one, this would allow the slide to exit faster - and - allow the case to clear the slide's port without hitting it.

That said - on a 1911 - you should own two springs - one for 230gr ball, another for light loads. Best to cold blue one of them so you can tell them apart. Smart people measure the spring when the gun is new. This way if you ever have a question - a simple ruler will tell you if it's the fault or not.

Colt 1911 Series 70

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Colt Mkiv Series 70

Most likely the ejection port has to be lowered. I did this to the ones I owned, and never had any dented cases.

MAYBE the magazine springs are old,,,buy 2 things new magazines the good brand not junk,,,then buy a repair kit with all the spings your baby neads,,buy the shootgun news at walmart or barns and noble its a news paper magazine better then guns and ammo,inside you will find wholesaler listing ,haft of what you a pay at the local gun store,,,good luck

Cheapest thing to check first is the recoil spring. I would replace that then see of it is still happening.

Nice pistol, btw.

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Don't fix problems that don't exist. It likes to dent cases.