Help me decide UMP 9,40 or 45? - Page 1

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[ARCHIVED THREAD] - Help me decide UMP 9,40 or 45?

Posted: 12/12/2018 12:46:20 AM EDT

I was thing about getting one of the Omega UMP clone receivers and a UMP kit from HKparts. But not sure which caliber. Leaning towards 40 or 45 since I have a 45 suppressor in jail and already have a PTR MP5 clone.

What’s everyone’s thoughts? Don’t say get them all, please.

Posted: 12/12/2018 1:26:11 AM EDT

[#1]

I liked the .45 one in counterstrike.

Also I think it is quieter with the silencer or at least you get more weight at subsonic speeds.

I'd get the one you think is coolest. With the silencer would be super badass :)

Posted: 12/12/2018 6:08:58 AM EDT

[#2]

Having recently purchased the Omega in 45, and having previously owned a USC converted UMP...I voted .45 acp for myself. Some things of consideration for me:

- .45 ammo is all subsonic and easily found (I remember when 9mm subsonic ammo didn’t actually cost more money

)

- I had a .45 suppressor as well (TiRant)

- I will buy the 9mm conversion later

Some things to know about the Omega 45....I am hearing the 3-lug attachment on the barrels are proprietary and will not be the same spec as B&T .45acp 3-lugs...also there are a lot of companies that sell a 3-lug adapter for their silencers but most are designed to shoot 9mm through .45acp cans and are not large enough to actually attach to .40/.45 3-lugs.

It is a shame since I want/wanted to run my UMP with the 3-lug.

I haven’t shot my Omega yet and I probably won’t for a few weeks but fit and finish is fine. There were minor scratches on the receiver from things like installing the bolt catch release.

Posted: 12/12/2018 9:30:44 AM EDT

[#3]

Just bought an Omega in .45, and have a USC and .45 Osprey as well.

I would second the barrel issue, as my initial research indicates the same.

I think there are other, cheaper choices for 9mm.

Posted: 12/12/2018 9:52:04 AM EDT

[#4]

My UMP is in .45 but I've been considering converting in to 9mm lately mainly just so that I can use a three lug barrel. It'd be nice to be able to quickly swap my can between my GHM9, MP5, and UMP all without having to change out any mounts on the suppressor.

Posted: 12/12/2018 10:34:32 AM EDT

[#5]

I have the 40 cal ump and love it, either will be a good choice I went with the 40 do to the 30rd mags, sadly the .45 is only 25rd.

Posted: 12/12/2018 10:59:39 AM EDT

[#6]

I feel like the only way Id want a UMP is for 45

You have the MP5 series for 9 and 40

Posted: 12/12/2018 1:13:48 PM EDT

[#7]

Quote History

Quoted:
I feel like the only way Id want a UMP is for 45

You have the MP5 series for 9 and 40

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My thoughts as well

Posted: 12/12/2018 3:20:48 PM EDT

[#8]

Toss up between .40 and .45 for me. 9mm seems like an abomination.

I really want a .40 PCC for some stupid reason.

Posted: 12/12/2018 3:36:17 PM EDT

[#9]

I have a USC converted UMP in 45. One of my favorite guns to shoot. Got to do 45!

Posted: 12/13/2018 10:49:53 AM EDT

[#10]

Quote History

Quoted:
I feel like the only way Id want a UMP is for 45

You have the MP5 series for 9 and 40

View Quote

This is the correct answer.

Posted: 12/13/2018 12:07:36 PM EDT

[#11]

45 it is. I was leaning towards towards that. Can use ball ammo and be subsonic with pretty much any ammo. Thanks everyone

Posted: 12/13/2018 12:13:03 PM EDT

[#12]

The caliber wars are over, and 9mm won.

If you want more energy, go with .40.

.45 is the worst of both worlds - less energy than the .40, and less capacity than either.

Posted: 12/13/2018 12:20:30 PM EDT

[#13]

Had the real deal at work in .45.

PASS

Posted: 12/13/2018 2:49:07 PM EDT

[#14]

I've used all three and have had my Bostic USC/UMP in .40 and .45. I am sticking with .40 because the mags and ammo are all significantly cheaper.

Posted: 12/13/2018 2:52:17 PM EDT

[#15]

45ACP UMP, 9mm MP5

Posted: 12/13/2018 3:32:59 PM EDT

[#16]

I used to have a USC converted to Ump with a real ump Barrel. I also had an AAC ump silencer that quickly attached to the UMP Barrel.

45 is definitely nice to suppress. I could actually hear bullet flight if I was shooting 50 yards or Beyond. I would hear the clack of the bolt a zzzzzzz noise and the thud of the bullet strike against the berm.

What wasn't cool was the fixed long LOP and all of the flex in the receiver.

Eta picture

Posted: 12/13/2018 8:34:12 PM EDT

[#17]

I think the ump should be .45 the way to roll on a UMP in my opinion atleast.

Posted: 12/14/2018 7:27:13 AM EDT

[#18]

Quote History

Quoted:

What wasn't cool was the fixed long LOP and all of the flex in the receiver.

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What kind of problem does 'flex in the receiver' cause, and how did it manifest itself?

Posted: 12/14/2018 12:18:39 PM EDT

[#19]

Quote History

Quoted:
What kind of problem does 'flex in the receiver' cause, and how did it manifest itself?

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Quoted:

Quoted:

What wasn't cool was the fixed long LOP and all of the flex in the receiver.

What kind of problem does 'flex in the receiver' cause, and how did it manifest itself?

No real problems other than it was distracting.

Posted: 12/31/2018 1:41:30 PM EDT

[#20]

Get the 9mm and 45acp...

Posted: 12/31/2018 10:09:15 PM EDT

[#21]

Frank just sold a full auto ump40 for $4500 or around there. Aaghhhgg. It was no law letter too

Posted: 1/6/2019 8:23:07 AM EDT

[#22]

I have a UMP that is All HK, built before 922 laws for SBRs. It was built with a New HK UMP Barrel and All New HK Parts. I also have a Gemtech UMP Suppressor for it. The suppresor is Full Auto Rated.

Posted: 1/6/2019 10:38:20 AM EDT

[#23]

Quote History

Quoted:
I have a UMP that is All HK, built before 922 laws for SBRs. It was built with a New HK UMP Barrel and All New HK Parts. I also have a Gemtech UMP Suppressor for it. The suppresor is Full Auto Rated.

https://imagizer.imageshack.com/v2/800x600q90/923/hEJBp9.jpg
https://imagizer.imageshack.com/v2/800x600q90/923/qzVTbK.jpg
https://imagizer.imageshack.com/v2/800x600q90/924/KCeSvg.jpg
https://imagizer.imageshack.com/v2/800x600q90/923/T5s75Z.jpg
https://imagizer.imageshack.com/v2/800x600q90/923/d5UcE5.jpg

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Beautiful, I'm waiting on a stamp for my Gemtech suppressor.

Posted: 1/6/2019 5:40:34 PM EDT

[#24]

Quote History

Quoted:
I have a UMP that is All HK, built before 922 laws for SBRs. It was built with a New HK UMP Barrel and All New HK Parts.

View Quote

Uh...922r is from 1989, and hasn't changed since. The UMP is from... '99ish?

Posted: 1/6/2019 6:00:53 PM EDT

[#25]

Quote History

Quoted:

Uh...922r is from 1989, and hasn't changed since. The UMP is from... '99ish?

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I would strongly urge everyone not to get caught up in the 922R hysteria.

For years it was thought that SBRs were exempt. That is likely what he is referring to. That being said, still haven't seen a 922r prosecution.

My UMP's trigger pack has US parts. Other than those parts being weak and inferior to their German counterparts I haven't a clue how an ATF officer would know that my UMP is in compliance.

Posted: 1/6/2019 9:11:07 PM EDT

[#26]

Quote History

Quoted:
Uh...922r is from 1989, and hasn't changed since. The UMP is from... '99ish?

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I have a UMP that is All HK, built before 922 laws for SBRs. It was built with a New HK UMP Barrel and All New HK Parts.

Uh...922r is from 1989, and hasn't changed since. The UMP is from... '99ish?

I’ve made it my entire gun buying life without worrying about 922R, which 99% of LEOs know nothing about, and I’d wager the majority of the ATF don’t even know about. Not sure how it’d be provable where specific parts originated from anyway most of the time anyway.

But let’s not get misconstrued. I totally follow 922R, like 100%. Just like I never go 1 mph over the speed limit.

ETA: to address the thread, I feel like on principle, UMPs should be .45. That may be years of video game indoctrination, however. I don’t really want .40 in general, and if I’m getting a 9mm HK subgun, I’m getting the master race 9mm HK subgun.

Posted: 1/7/2019 12:36:08 PM EDT

[#27]

For those of you who want to suppress a .45 UMP and use a 3-lug when you SBR it; chop your USC barrel and thread it to .578x28.

SiCo makes a .45ACP 3-lug mount in that thread pitch. Their 3-lug adapters that screw into the can fits the Omega 45, Osprey, Octane 45 (and K versions), and any other can that threads to the SiCo spec.

Posted: 1/8/2019 8:03:27 AM EDT

[#28]

Quote History

Quoted:

Uh...922r is from 1989, and hasn't changed since. The UMP is from... '99ish?

View Quote

It wasn't put into effect for NFA weapons until some idiot asked the ATF if he needed to comply with 922r it while building an SBR. Then the ATF came out with a ruling that that stated from that day on all SBRs needed to comply with 922r. My UMP along with many others were already built so we were grandfathered. Many years ago that was a big topic on the HK forums.

Posted: 1/8/2019 8:51:21 AM EDT

[#29]

It’s 2019, so 9mm. The 9mm vs .40 vs .45 debate was an debate from the 90’s and 9mm won that debate

Posted: 1/8/2019 11:02:01 AM EDT

[#30]

Quote History

Quoted:
It’s 2019, so 9mm. The 9mm vs .40 vs .45 debate was an debate from the 90’s and 9mm won that debate

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.45 still has the advantage of greater kinetic energy and expansion compared to subsonic 9mm loads. This, for suppressed shooting, a strong argument can be made for .45.

.40 has no advantages other than being cheap in terms of parts kits.

Posted: 1/8/2019 3:44:20 PM EDT

[#31]

Quote History

Quoted:

Then the ATF came out with a ruling that that stated ~~from that day on~~ all SBRs needed to comply with 922r.

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FIFY.

I don't live my life in fear of 922r, and I don't think anyone else should either, but if it's not written in the CFR, it's not law.

Posted: 1/15/2019 9:42:35 PM EDT

[#32]

Quoted:
I was thing about getting one of the Omega UMP clone receivers and a UMP kit from HKparts. But not sure which caliber. Leaning towards 40 or 45 since I have a 45 suppressor in jail and already have a PTR MP5 clone.

What’s everyone’s thoughts? Don’t say get them all, please.

View Quote

I bought two USCs this summer and had Tom Bostic do both .45 and 9 mm conversions. If I had to choose one, I would go with .45 acp.

9 mm UMPs leave much to be desired. More recoil than other 9 mm PCCs, not so great ergonomics because of the stock and your stuck using a MM’s conversion kit, which I had to send back to them to fix for a bad (tight) chamber and extractor. It runs now but still leaves geek marks on the brass.

The .45 acp version uses Tom’s trigger, US made floor plates and followers for the necessary 922r parts. Hence, it still uses the USC’s bolt and other German parts. Use German mag bodies (since the feed lips are the best) and I have had zero issues.

Can’t comment about .40 cal conversions. I would still do .45 acp though since the gun was designed around the cartridge. It just shoots better with it. Hard to explain unless you’ve shot both alongside a 9 mm AR and MP5 clone.

Posted: 1/15/2019 9:43:46 PM EDT

[#33]

Quote History

Quoted:
For those of you who want to suppress a .45 UMP and use a 3-lug when you SBR it; chop your USC barrel and thread it to .578x28.

SiCo makes a .45ACP 3-lug mount in that thread pitch. Their 3-lug adapters that screw into the can fits the Omega 45, Osprey, Octane 45 (and K versions), and any other can that threads to the SiCo spec.

View Quote

What is your POI shift with that set up?