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Discussion Starter · #1 ·
I made an impulse buy at a local gun store and bought two of these things without doing any research. And I feel like, unlike most firearms, when you get involved with this weapon platform, you have to have a clear sight picture of where you want to end up and how to get there or you may end up wasting a lot of money.

I have a few questions about the gun...

The tabs that are welded to the rear of the receiver, why? ATF?

Can I put an original style telescopic stock on? Like the one that slides down the receiver grooves. A3 I think might be the name???

Seems like HK goes out of there way to cause owners more headaches.
 

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The tabs are MP5K design, you cannot use a telescoping stock on a K rear, if you want a K size gun with the telescoping stock, you need a reverse stretch MP5
 

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HK Shooting Team
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I made an impulse buy at a local gun store and bought two of these things without doing any research. And I feel like, unlike most firearms, when you get involved with this weapon platform, you have to have a clear sight picture of where you want to end up and how to get there or you may end up wasting a lot of money.

I have a few questions about the gun...

The tabs that are welded to the rear of the receiver, why? ATF?

Can I put an original style telescopic stock on? Like the one that slides down the receiver grooves. A3 I think might be the name???

Seems like HK goes out of there way to cause owners more headaches.
I would suggest you use this site to study up on the full size MP5 platform and the short MP5K/SP89/SP5K platform... you have some educating to do

No, HK does not go out of their way to cause headaches

Do some studying, you'll feel better!
 

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My thoughts are you did good....

One to stock and one to rock. There are options on hkparts website. They even demo one on YouTube about 325 bucks though. Then you have to apply for sbr tax stamp etc... check the NFA section. Plenty of talk there. I only have 1 for now, no stock no modifications. I left it as is.
 

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Discussion Starter · #5 ·
So just clarifying, it's not as simple as getting a stamp, grinding the welds, and slapping that stock on...

Yeah I have a lot of reading to do.

Thanks for the info guys.
 

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Hold on, don't grind any welds quite yet. The pieces of metal at the back of the receiver are part of the MP5K design. The link is to HK's MP5K page, you can see them there. Now, depending on what you're looking to do exactly you have some choices. Some people like to have a paddle magazine release, that's doable. Some people want the barrel to end at the front sight tower, some want a three lug barrel that extends past the front sight tower. Either one is possible. In addition to a tax stamp and stock you also need to comply with 922(r) to legally make it a rifle. To comply with 922(r) you need 6 pieces from a specific list of parts that are of US manufacture. There are a lot of threads about the SP5K on here, search for them and read up before you make any changes.
 

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You did great op, learning all the options with these guns is part of the fun. Enjoy the ride!
 

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So just clarifying, it's not as simple as getting a stamp, grinding the welds, and slapping that stock on...

Yeah I have a lot of reading to do.

Thanks for the info guys.
A folding stock, which it will accept without modification, will provide you with a smaller package anyway -- and small package is what the K gun is all about.
 

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do not regret an SP5k.. best civilian K gun, also the best host for a sear for whenever you have the disposable income.. or when the 2nd amendment gods come during this 4 tenure.
 

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Discussion Starter · #12 ·
Haha, thanks for all the info guys. Now I'm undecided what route I want to go. There will I read somewhere that the mags only count as two parts towards 922. That's garbage. I guess when I restock my cash pile ill have to buy another mp5 style weapon that will take an a3. Sorry I haven't caught on to the HK verbiage yet.
 

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...I read somewhere that the mags only count as two parts towards 922. That's garbage...
A magazine made entirely in the U.S. counts as 3, 922(r) compliant parts. The statement to which you reference had to do with the US magazines offered by HKPARTS.NET. Those count as 2, 922(r) compliant parts because they use a German follower. The 3 magazine parts are housing, follower and floor plate. If you find magazines where all of those parts are sourced in the U.S., then they are, indeed, 3 compliant parts.
 

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The tabs that are welded to the rear of the receiver, why? Prevent full-auto bolt carrier from being used.

Can I put an original style telescopic stock on? No.
 
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