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Any help at all would be much appreciated
Sorry, no help with this.Question 1-- I'm not sure who the maker of this flat is, I don't think it's an LSC flat because the holes for sling attachment are not predrilled in the mag well and the cocking tube notches are not present on the LSC. Can anyone ID this flat so I know in the future?
I really think you need to take a step back and examine the details on the MP5 variants, especially the the receiver and cocking tube, so you'll have a better understanding of what your getting into. I think you got ahead of yourself....how is your receiver set up, one or two holes?Question 2--With this flat, are my options an MP5, or MP5K, or MP5K reverse stretch or MP5SD? Can I make any one of these or am I just limited to MP5? I see LSC offering a flat specifically for the MP5K and now I'm confused. I thought the receiver was the same for all with differences being in the cocking tube, trunion, barrel, bolt group, etc. and not the receiver itself.
There is a bit more to it than that.Question 3-- The flat has a cocking tube notch already. Am I supposed to cut that out flush and slide the new cocking tube in that area then weld? If so, what kind of measurements are required. I've searched and can't really find a definitive answer. I'm supposing I'd use the new cocking tube to measure and cut the notch out.
Thanks for the help! Appreciate you very much!!! Sometimes a guy just needs the obvious pointed out - not BS replies (although very amusing) and mis-information about being a "premium" member.Sorry, no help with this.
I really think you need to take a step back and examine the details on the MP5 variants, especially the the receiver and cocking tube, so you'll have a better understanding of what your getting into. I think you got ahead of yourself....how is your receiver set up, one or two holes?
View attachment 68849
The Submachine Guns
There is a bit more to it than that.
This is a great tool to have in the box- a simple aluminum rod that is tuned to the cocking piece diameter and the receiver diameter. It acts like a heat sink during welding and also aligns the tube perfectly the the inside diameter of the receiver. I lived without this one on the few builds and can't remember why I didn't male one sooner, it makes life much easier. I made this one for a tight fit, I have to hammer it a bit to get it in and out.
Your cocking tube is not far enough back. The proper inset is approx 0.875" from the leading front edge of the trunion.I got around to working on this yesterday as I received the German cocking tube, trunion and barrel. I began by grinding/ shaving the SW cocking tube recess down to the bolt carrier tube and test fitted the cocking tube as I went along. I went back just enough to match where the SW cocking tube was on the flat originally. After a while, it slid right in snugly!
Fitment looks good to me - what do you think?
No binding inside on the bolt drop. Carrier slides smooth.
I know the Trunion needs to go in a hair more - I'm just dry fitting at this point. One thing I learned for sure is the trunion has to go in before the cocking tube can. I was thinking of tack welding cocking tube in place, but after dry fitting - that's a definite no-no. The ledge on the back side of the trunion really caused me trouble inserting the cocking tube. That's when I took a harder look at the "receiver side" of the cocking tube where it's inserted and found that the upper left was mis-shaped causing the tube to cant down and to the right just enough (when fully inserted) to cause it to bind on the ledge. Once I got that round again - the tube slid right over the ledge very snug. I used a 20mm piece round stock I had to reshape the cocking tube and that worked out very well.
And here's where I'm at right now. Yes I know that's the wrong trigger housing for the MP5K
Here's where I'd like to be:
Here's some misc parts I need / looking for:
Rear Stock....researching how to attach that rear stock (A3 I believe). I'm looking but cannot find a definite answer how to fit to MP5K
Paddle Mag - the whole kit. I've bought the jig from HKParts
cocking tube cap
correct lower housing - would love a pictogram