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Discussion Starter · #1 ·
I have a Form 1 that I submitted in July to make a CZ Scorpion SBR. I probably would have forked over the cash for an SP5K instead if I had realized I might have been able to get one filed before the 41F deadline.

Recently, I can't stop thinking about what mods I would make if I SBR'd a SP5K. I was thinking I would probably go with the standard B&T folding stock, but then I came across an interesting picture:

Firearm Gun Trigger Assault rifle Rifle

(source: https://www.hkparts.net/shop/pc/Surefire-M77-Tri-Rail-For-MP5K-SP89-Clones-349p389.htm)

I just think that setup looks amazing, and very functional/compact. If I'm not mistaken, that's the 'K' model, but with the telescoping stock that I thought was only normally possible on the full-size version. Can anyone provide info about that stock with the 'K' model? I had thought that it would take adapters and custom work to make that possible.

Also:
- Does anyone have experience with that Surefire Tri-Rail? I'm interested in being able to mount a weapon light, and that seems like the ideal rail for the job. It's still currently available from HKParts - but I think it's crazy that Surefire would stop producing it, since the SP5K has just breathed fresh life into the MP5 world (maybe they'll start production again?).
- Does anyone prefer the more traditional MP5 rear sight rather than the one that comes with the 'K' models? Are there pros and cons to either sight picture? Once approved, I would probably never use the SP5K without a stock, so I wonder if the traditional rear sight would perhaps be 'better'.
- Do you prefer a magwell hold, or the VFG? Why? I see the factory VFG on most K-PDW configurations, but I think a maxwell hold would probably be more comfortable/intuitive for me.

All this stuff about barrel swaps, locking pieces, paddle mag releases, forends, stocks, just screams $$$$$. I'm debating just canceling my pending Scorpion Form 1 and selling the pistol it if it would make this project more affordable, but the 'reasonable' part of me is saying just keep the Scorpion and have fun with it until I can really afford this project later on. The Scorpion is a cool gun for the money, but the HK is just THE subgun, you know? I appreciate any and all comments, especially any answers to my questions (I've shot a few MP5's and one Scorpion but I'm still relatively uneducated about subguns/PCC's).

***(Being an HK nut is killing my wallet)***
 

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Welcome,

That is a reverse stretch gun.

Never made by HK, it's an MP5 receiver with a K front end. A custom creation by US manufacturers, and a completely different receiver style than the SP5K.

You cannot install that stock on any K model because it won't fit, and the receiver reinforcements won't permit it.

On a short forend, a vertical grip is generally better than a magwell grip. The further apart your hands are, the more control you will have.
 

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Sorry, but it looks like an abomination to me. Funky configurations make me cringe. Many of these weapons are worth north of $32k. When you boog it up, it just makes me shake my head. To each their own, but when something bad happens and you need to sell it. See what you get for it vs my factory perfect PPRR gun. Not being cocky, but that's what runs through my head when I see things like that.

Sean
 

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Discussion Starter · #4 ·
Welcome,

That is a reverse stretch gun.

Never made by HK, it's an MP5 receiver with a K front end. A custom creation by US manufacturers, and a completely different receiver style than the SP5K.

You cannot install that stock on any K model because it won't fit, and the receiver reinforcements won't permit it.

On a short forend, a vertical grip is generally better than a magwell grip. The further apart your hands are, the more control you will have.
Great info, thanks! I hadn't thought about the distance between the hands & weapon control, that's an excellent point.

Sorry, but it looks like an abomination to me. Funky configurations make me cringe. Many of these weapons are worth north of $32k. When you boog it up, it just makes me shake my head. To each their own, but when something bad happens and you need to sell it. See what you get for it vs my factory perfect PPRR gun. Not being cocky, but that's what runs through my head when I see things like that.

Sean
I understand where you're coming from. This particular one just appealed to me visually, but it looks like it's not an option starting from the SP5K lower.

My budget doesn't even allow me to even think about the full-auto models (anything north of several grand is just never going to happen for me), so anything I SBR'd would only ever be owned and appreciated by myself or tolerated by whoever inherits it after I pass away ;)
 

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As Fargo said it is a Reverse Stretch gun, which HK never made. I have a Dakota Tactical RS with the B&T folding stock. Very nice gun. My favorite, though, is the MP5K, also with a B&T stock (different model for the K gun). The K is very compact and handles very well with the vertical foregrip IMO. It has a higher cyclic rate than the stretch or the full size.
 

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Great info, thanks! I hadn't thought about the distance between the hands & weapon control, that's an excellent point.



I understand where you're coming from. This particular one just appealed to me visually, but it looks like it's not an option starting from the SP5K lower.

My budget doesn't even allow me to even think about the full-auto models (anything north of several grand is just never going to happen for me), so anything I SBR'd would only ever be owned and appreciated by myself or tolerated by whoever inherits it after I pass away ;)
I get the money thing. You can build an MP5K host from an SP89 or an SP5K. Have it sbrd by the right guy and you have a host that's worth a pretty piece of change. I built an HK 53 for a few grand after I sold the old 93 parts. It can be done.

Sean
 

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If you want a reverse stretch, then go for it. Get a clone or non-German authorized gun and chop away. But too expensive to sacrifice the real original German deal to make.
 

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If you want a reverse stretch, then go for it. Get a clone or non-German authorized gun and chop away. But too expensive to sacrifice the real original German deal to make.
I totally agree with you Phil. That is probably what I should have said. These guns are worth to much to "customize".

Sean
 
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