The purpose of this thread is to aggregate info about H&K pistol mods and conversions that are verboten! This thread is intended to be all in good fun, and potentially we might even gain some interesting knowledge from it, even if that is only a list of things not to do. 
If you consider yourself a "purist" because you prefer H&K's in stock form, or enjoy the provenance and accuracy of "numbers-matching" or perfectly replicating stock configuration... this is not a dig at you either! I am a die-hard H&K enthusiast and understand the enjoyment people get out of those types of collection activities. I especially understand the draw for that considering the sheer variety of configurations the company has produced, as well as the obscurity of some of them which drives the WANT factor through the roof! I fully appreciate the enjoyment fellow enthusiasts find in that niche.
My opinion is that life can be far more fun and interesting without ragging on people's attempts to experiment and see what's possible. So feel free to post your mods and conversions. That could be:
I can legitimately see a few of these offering more tangible improvements. For example, as we all well know, USPs have seriously beefy slides. Judging by weight differences in several models, there might be a weight reduction in a combo like a P2000 slide on a USP Compact frame. Assuming this even works, seems like potentially a ~2-3oz reduction for the 9mm or 40s&w models, but that is just a guess.
Generally, many of the USP and P or HK45 variants seem to have the same or very close to the same placement and dimensions of the critical components in the slide and frame that interface with each other. For example:
Obviously most critical is going to be ensuring proper barrel lockup, all factory safety features still being retained, no possibility of firing out of battery, etc. Anyways, here's a few teaser pics to get the ball rolling, with more to come soon as I find time to take caliper measurements, compare components like recoil spring assemblies, etc. Please excuse the terrible image quality. This was rushed since I was excited tonight after picking up the USP9C @Guyanaman1963 graciously shared on the "Found a Deal" section.
Component & Configuration Weights
The below are all 9mm slides and frames. No magazines were included in these weights. All ambidextrous guns have had their right side slide release levers removed as I do not use them and am not a fan of HK's solution for them. All guns are using OEM barrels.
Weights were taken with a digital scale showing a deviation of -0.033 to +0.076 ounces, with an average deviation of 0.041 ounces. For all of these configurations, including some of my non-standard modifications, the maximum difference in weight seen was approximately 1.12oz which is negligible at best. Weight isn't really a factor or consideration I'd worry about here.
The USP Compact example used is a bone stock V1 with factory three dot sights.
The P2000 DA/SA example used is a V3 with a GGI trigger job, which includes NP3 coated internals and an XL backstrap. The P2000 LEM example is a converted V3 with a GGI SRT kit and a Medium backstrap. The P2000 slide example is stock with Meprolight tritium sights.
The P30 example is a V1 LEM with a 4.1ch + GGI SRT kit, GGI flat trigger, Medium backstrap, Large side panels, Trijicon fiber rear sight, and Heinie tritium front sight, and factory slim/short slide release lever.
Table Footnotes
* Configuration does not appear to function. Trigger does not trip the sear and release the hammer, possibly due to disconnector interference.
My Outlook for This Thread
Some of the impetus for this thread is my own annoyance with people on other forums that call themselves enthusiasts, but frown upon "unapproved" or non-stock / non-OEM modifications. I'm not talking about anyone here, but rather some on certain other forums... I'm also not talking about things we might all relatively agree are tasteless modifications.If you consider yourself a "purist" because you prefer H&K's in stock form, or enjoy the provenance and accuracy of "numbers-matching" or perfectly replicating stock configuration... this is not a dig at you either! I am a die-hard H&K enthusiast and understand the enjoyment people get out of those types of collection activities. I especially understand the draw for that considering the sheer variety of configurations the company has produced, as well as the obscurity of some of them which drives the WANT factor through the roof! I fully appreciate the enjoyment fellow enthusiasts find in that niche.
My opinion is that life can be far more fun and interesting without ragging on people's attempts to experiment and see what's possible. So feel free to post your mods and conversions. That could be:
- Caliber conversions
- Frame and slide swaps
- Red dot slide cuts
- Stipple jobs
Disclaimer
We're just having fun here, so do your own due diligence! Don't assume any of these mods are even a good idea or will not adversely affect durability and reliability! Bonus points for caliper measurements, torture tests, and other hard data! There are a few of these frame and slide swaps I do plan to test more extensively myself, as there's a few combinations I'm considering for more serious use if they seem to perform fine. We're all adults here, and I certainly hope the feedback will be constructive (good and bad) as opposed to the mindless rants I've seen on certain other sites.Frame & Slide Swaps
To start off with, here are a few conversions that have been on my mind lately. I heard awhile back that some of the major parts are interchangeable between the USP Compact (40 or 9), P2000, and P30. Many of the internals are, but I'm specifically talking about slides and frames. I haven't 100% liked the grip of the P30, so I was wondering about swapping slides and frames between some of these. I'm highly interested to see whether some of these other combos are possible or not, and may try some of them later this year once I acquire a few more H&Ks:- HK45C slide on USP45 Compact frame (Seen pics from another forum, seems possible)
- P2000 slide on USP9 Compact frame (I am VERY interested in this)
- P30 slide on USP9 Compact frame
- P30L slide on USP9 full size frame (I'm guessing this will not work)
- P30SK slide on P2000SK frame (Someone on another forum said they've done this)
- P2000SK slide on P30SK frame
I can legitimately see a few of these offering more tangible improvements. For example, as we all well know, USPs have seriously beefy slides. Judging by weight differences in several models, there might be a weight reduction in a combo like a P2000 slide on a USP Compact frame. Assuming this even works, seems like potentially a ~2-3oz reduction for the 9mm or 40s&w models, but that is just a guess.
Generally, many of the USP and P or HK45 variants seem to have the same or very close to the same placement and dimensions of the critical components in the slide and frame that interface with each other. For example:
- Firing pin safety
- Extractor hook
- Ejector
- Pins in the slide
- Slide release lever (Some differences in shape, but placement appears the same or similar between equivalent models like P30 vs P2000, or P30SK vs P2000SK)
Obviously most critical is going to be ensuring proper barrel lockup, all factory safety features still being retained, no possibility of firing out of battery, etc. Anyways, here's a few teaser pics to get the ball rolling, with more to come soon as I find time to take caliper measurements, compare components like recoil spring assemblies, etc. Please excuse the terrible image quality. This was rushed since I was excited tonight after picking up the USP9C @Guyanaman1963 graciously shared on the "Found a Deal" section.
Component & Configuration Weights
The below are all 9mm slides and frames. No magazines were included in these weights. All ambidextrous guns have had their right side slide release levers removed as I do not use them and am not a fan of HK's solution for them. All guns are using OEM barrels.
Weights were taken with a digital scale showing a deviation of -0.033 to +0.076 ounces, with an average deviation of 0.041 ounces. For all of these configurations, including some of my non-standard modifications, the maximum difference in weight seen was approximately 1.12oz which is negligible at best. Weight isn't really a factor or consideration I'd worry about here.
The USP Compact example used is a bone stock V1 with factory three dot sights.
The P2000 DA/SA example used is a V3 with a GGI trigger job, which includes NP3 coated internals and an XL backstrap. The P2000 LEM example is a converted V3 with a GGI SRT kit and a Medium backstrap. The P2000 slide example is stock with Meprolight tritium sights.
The P30 example is a V1 LEM with a 4.1ch + GGI SRT kit, GGI flat trigger, Medium backstrap, Large side panels, Trijicon fiber rear sight, and Heinie tritium front sight, and factory slim/short slide release lever.
| Part | Weight (in ounces) |
|---|---|
| USPC Complete | 22.89 |
| P2000 Complete (DA/SA) | 22.47 |
| P2000 Complete (LEM) | 22.05 |
| P30 Complete (LEM) | 22.86 |
| USP2000C (USPC Frame, P2K Slide, P2K RSA)* | 22.43 |
| USP30C (USPC Frame, P30 Slide, P2K RSA)* | 23.1 |
| P2000PC (P2K Frame, LEM, USPC Slide) | 22.47 |
| P2000PC (P2K Frame, DA/SA, USPC Slide) | 22.96 |
| P2000L (P2K Frame, DA/SA, P30 Slide) | 23.17 |
| P2000L (P2K Frame, LEM, P30 Slide) | 22.68 |
| P30C (P30 Frame, P2K Slide, P30 RSA) | 22.15 |
| P30PC (P30 Frame, USPC Slide, P30 RSA) | 22.65 |
| USPC Slide | 15.56 |
| P30 Slide | 15.66 |
| P2000 Slide | 15.06 |
| USPC Frame (DA/SA) | 7.337 |
| P30 Frame (LEM) | 7.196 |
| P2000 Frame (DA/SA) | 7.408 |
| P2000 Frame (LEM) | 6.914 |
Table Footnotes
* Configuration does not appear to function. Trigger does not trip the sear and release the hammer, possibly due to disconnector interference.
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