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Discussion Starter #1
Hey, guys. I'm new here, but I recently became the owner of a Walther MP5 .22 after a night of drinking at a fundraiser event. (There's a reason they have open bars.) :100000:

Since I can't stand the idea of long barrels on these little plinking guns and I want to be able to run a suppressor, I'm looking into doing an SBR conversion on it. The HOW-TO: Convert Umarex MP5 SD -> A5 and SBR the Umarex MP5 A5 thread on this forum has been an excellent resource so far, but I'm running into one "little" issue. They used this nifty little thread adapter from HKParts that both secures the barrel inside the barrel sleeve/sheath and converts to the more-standard 1/2x28 threads for the suppressor. I can't find anyone that can cut and thread my barrel to M8x0.75. My local go-to gunsmith says he can't do these threads on his lathe, and Mark at TROS says "I no longer do those" (didn't get anything more out of him, so I'm not exactly sure if he's saying barrel threading in general or something about this particular type of job).

So I have two questions:
  1. Does anyone know of a service that would be able to cut and thread my barrel to M8x0.75?
  2. Has anyone done this type of conversion with threads other than M8x0.75, and what thread adapter did you use or how did you secure the barrel inside the "barrel sleeve"?
Thanks.
 

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I've got you brother. This is from another post.

I got the A5 model several weeks ago. Great gun & tons of fun.

Get the replacement trigger springs from HKParts. Current Trigger pull varies around 8.5-9lbs; After the trigger job, I am pulling around 4.5lbs consistently.

https://www.hkparts.net/shop/pc/MP5-...-342p17335.htm

Also, FYI, after you file for your SBR license with ATF, you can order a replacement barrel for the HK 416 .22LR pistol from Umarex (**Has to be ordered over the phone from Umarex; not available on-line [$128]), which is a direct drop-in replacement for the currently installed barrel and then you can get rid of the faux suppressor. The replacement 416 barrel has a threaded end, just like the one that is being replaced; get the threaded barrel adapter from HKParts (1/2x28) and you can have an MP5 22LR that looks closer to the original. (HK416 .22LR pistol barrel --- part #576.52.02; Telephone#: 479-646-4210)

https://www.hkparts.net/shop/pc/HK-W...8-342p1845.htm

*From another HKPro post: You only need to buy the HK416 .22LR pistol barrel from Umarex, part #576.52.02 which was $128 as of three weeks ago. Since this option will require you to cut your existing sheath but not your barrel, you might want to consider buying a replacement sheath so that if you want to go back to the original configuration at any time you can. It is part #578.51.01.1 and cost $33 as of 1/24/14. If they are out of stock on the barrels, which happens from time to time, you can sometimes find one on the used market

There are a number of videos and other threads that cover all of this:

http://www.hkpro.com/forum/hk-clone-talk/194603-how-convert-umarex-mp5-sd-a5-sbr-umarex-mp5-a5.html

Great Video to watch, read over the comments and shoot Steve a message and he always responds, most of the time on the same day:
https://www.youtube.com/watch?v=B99hxnvZBdo
 

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Discussion Starter #5
Thanks for the info. Hadn't even thought about doing anything to the trigger yet.

For some reason I was thinking there was a downside to using the HK 416 barrel. Reading back through that post, it says that it's about 1/2" short, so you lose the ability to put on the fake tri-lug. Anything else to be concerned about? Happen to have a picture of what the result looks like?
 
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