Colt mark4 factory 9mm conversion unit

[dave the boar]

hello. I'm new here . I'm trying to find any type of information on a factory colt mark4 series 80 9mm conversion unit. It converts a series 80 colt in .45acp into a 9mm parebellum. I really appreciate any help thanks again

[Iphung728]

I have one too, and would love to find more info about it, as well. I think it was a trainer for the military to save on .45 ammo, that’s my thought. Maybe someone knows more

[SkyHawk]

Unless you post good pictures of exactly what you have including any packaging and papers, you are not going to get very good info

I have one too, and would love to find more info about it, as well. I think it was a trainer for the military to save on .45 ammo, that’s my thought. Maybe someone knows more

The military did not use Series 80 1911s, so no.

[dave the boar]

Have you used it? How well does it function? I don't have a series 80 to put it on.thanks

[SkyHawk]

Have you used it? How well does it function? I don't have a series 80 to put it on.thanks

take out the firing pin block and you can use it on a Series 70 style frame

[dave the boar]

Appreciate the information Im not sure how to tag SKY HAWK. I actually don't even have a colt I was wondering if I should keep it ,or trade/sell it but have no idea the realistic value . The guy from the military store asked his friend and he said about 1.500 to a collecter but didn't have any info other than there pretty rare seen the .22 conversions for 6 to12 and they aren't nearly as rare ,I think.

[SkyHawk]

Appreciate the information Im not sure how to tag SKY HAWK. I actually don't even have a colt I was wondering if I should keep it ,or trade/sell it but have no idea the realistic value . The guy from the military store asked his friend and he said about 1.500 to a collecter but didn't have any info other than there pretty rare seen the .22 conversions for 6 to12 and they aren't nearly as rare ,I think.

We need to see good pictures of the item and also any packaging and/or paperwork included to help you determine the value.

When it comes to Colt and collectors, the condition means everything and having original packaging can also make a big $$ difference

[SkyHawk]

Here a whole gun and conversion kit went for $2k

https://www.gunbroker.com/item/928256963

So $1500 may be a stretch unless it is in pristine condition.

Also, is it a government length slide or commander length?

Posting a few good pics can answer a hundred questions

[dave the boar]

As soon as I figure out how to upload pics I will. near perfect condition ,no box.

[dave the boar]

The side opposite of the ejector says "colt mk 4" the 4 is in romen numerals, below it says "series80" and a dancing colt to the right of that. Ejection side says "9mm conversion unit" that's it ,no other markings on the slide. The barrel is marked "cal.9mm" and " -PARRABELLUM-" underneath. It has adjustable rear sights, that adjust elevation and windage, a flat top that resembles a colt gold cup, angled serrated slde and serrated flat top

[dave the boar]

Does yours have a flat top or does it look like the pic in the link

[dave the boar]

bump

[JTROKS]

I just want to see what mods Colt did to the 9mm barrel to make it work with the 45ACP ramp on the frame. Can you remove the barrel then stick a live 9mm round in the chamber, take a pic of the unsupported area of the 9mm web area.

[dave the boar]

Jtrocks yes will do

[nitroxdiver]