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Discussion Starter #1
I was refinishing my HK33 and correcting an old fabrication mistake- I had welded the sight base a little to far forward so the claw pad was not perfectly inline with the mounting points on the receiver when I made the rifle. It was still usable and very accurate and repeatable but it just bothered me, so I cut off the old sight base and welded a new base in, then realized something that I had not seen done. The idea was to take an MP5 pad weldment I had found in my parts bin and weld that pad above the appropriate receiver mount point, so the claw mount now has two pads to register into. The result was a much more stiff connection, it feels better than having just 1 pad.

Wonder why HK never did this or am I just ignorant? Pretty sure the master builders have long figured this out but I just have not seen one done this way yet. Any drawbacks? It seems like a win-win. It's a little more difficult to wrestle the claw off but it's no big deal.




 

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I think that is really neat, and that just ain't gonna' move a bit!

DDG
 

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Your receiver lacks the centerline "rib" that is found on the German receivers. The "rib" features an additional raised area for the claw mount.

When SW rolled them, they stamped the centerline rib as well as the additional raised area. When you roll your own from an SW flat, you will not have those features.

If you look close, you can see it in this photo...





Also seen here on the PTR91 flat (same format)

 

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Discussion Starter #4
Ah, that makes sense, I knew there was a simple answer, thanks Chopstix. The Germans never leave details out!

My PTR has a rail welded over it so I never noticed. I have a PTR receiver coming in for my Frankenstein MSG build, I think I might grind that hump down and use a MP5 pad there on that build as well- it just seems more solid. Going to have to think about it.
 

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Ah, that makes sense, I knew there was a simple answer, thanks Chopstix. The Germans never leave details out!

My PTR has a rail welded over it so I never noticed. I have a PTR receiver coming in for my Frankenstein MSG build, I think I might grind that hump down and use a MP5 pad there on that build as well- it just seems more solid. Going to have to think about it.
Don't do that to the PTR receiver--in order to remove enough for the MP5 tab to work, you'll end up cutting through the receiver. Besides, the mounting design on the G3 is tried and true.
 
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