Sunday answer September 21

This is the magazine well from a SA-80. Here are a few more pictures of the stamping.





The next two pictures show it in the actual rifle.


IMG_0222_swHope you enjoyed this post. As always comments and opinions are welcome.

What is it Saturday September 20



More interesting web stuff

There is a good article at the firearms blog concerning the tappet system of operation. This is the operating system used on the M-1 Carbine and on the Beretta 30 carbine rifle. Check it out.

While I am on the topic of interesting stuff on the internet. If you have not been to Impro Guns you should check it out. Here is there web page.

One last link and that is for a guy that makes some nice stuff. I go to his site quite frequently to study his methods.

Video Friday 9-19

I have not finished the editing of the Japanese 99 magazine stamping die video. So today I am going to post a video of the illegal gun making in the Philippines. This video really reminds me of the first weapon that I made 40 years ago. No machine tools to speak of and no quality control. Just keep filing until it fit and operated. I will have the edited video this weekend.


I am not going to do a library post today. Instead I am going to post about my day yesterday.

I had the opportunity to chat with a great design team that has been working on some new magazine and weapon designs that unfortunately at this point I can not go into. However, what I can talk about is what I learn in the few hours that I was able to spend with them. I realize that I have so much more to learn that I can not possible get to where I want to be in my life time. Just the few minutes we spent with them talking about magazine design open my eyes to what I have been doing wrong in some of my own designs. There help way beyond measure and with the insight provided I can now continue with my 7.62x54r Bren gun magazine design.

They were able to help me find other contractors that could help with wire EDM and deep hole drilling problems that we have been having. Finding good sub contractors is really a task. We have been looking for a good deep hole drilling company for quite some time. With there knowledge I will be able to take the next step on the FG-42 first model. The conversion  about dwell time open my eyes to a way to correct a design problem that we have been having with a new rifle project that we are working on.

The wire EDM guy they are using understands the accuracy needs that we are facing on one of our projects as well as the grinding and heat treating requirements that we need. The conversation concerning steels and heat treating was just great.

I was able to test fire there newest design which is better then anything else that I have shot recently. It is truly years ahead of the rest of the weapons designs out there.

One of the services they offered and I will take them up on is their use of their high speed camera. With this service I can now take detail pictures of the weapons we make making. This will answer a number of questions for us concerning the design and operation of our guns.

I just hope that I did not embarrass myself to much as to not be allowed to come back and talk with them again. I really enjoy the time I spent with people that know there stuff. I always feel a little less then adequate after a day like today, not because of anything they said or did but because of what they open my eyes to.

I hope in the future I can mention the design team by name. These are the type of people that truly make the world turn on its axis. Great men just designing and building with no fan fare.I hope that in some small measure we are able to help them continue with there project.

And as if this day could get no better I received a call from one of the members of this site and we went into the some of the problems that we have been dealing with concerning our stampings. The knowledge that he shared with me dealing with sheet metal and stamping has truly helped in the design of the next set of dies we make.

This day was just GREAT. What I hope to do with this site is to present you with the kind of information I obtained today. I know that my post today does not do the day justice. However, I have written down two pages of notes of information that I have learned today and in the future will be able to incorporate that knowledge into the designs that we build here.

Thanks again to everyone for making this a great day.

Interesting video

This is a video that I just saw posted at weapons man. If you are not going to his site yet you should be. This is a video put out my the British government concerning making the Sten gun. It is well worth watching.

Wednesday More designing on the fluting press

We have finished what I think is the last of the designing work on the chamber fluting press. Next week after the die is off the HAAS machine we will start machining the individual components. So here is the final design.

flutting machine final 2

flutting machine final 1

We added a guide rod to insure that the tool head will not move. We also now use 4 pins instead of three for the lower plate. This was necessary to add the slot for the guide rod. It will be exciting to complete this project and have it mounted and finishing the barrels.

Shop Tuesday 9-16 solid model the MP-44 trunnion

A friend of mine dropped me an e-mail wanting to know if I had drawings for the trunnion of a MP-44 and being a fanatic on engineered drawings I said yes. These are the same drawings that are all over the internet and they are wrong. So I decided to set down and make a correct solid model for him. Using the drawings as a starting point then I measured one as well as the parts that attach to them.



IMG_2456_sThis is a solid model that I did last Saturday on the trunnion.

MP-44 trunion4

MP-44 trunion3

MP-44 trunion2

MP-44 trunion1

MP-44 trunion5There are differences even between trunnions. Here are pictures of one in the rifle and one that has been removed from a rifle. You can see the differences just in the upper radius where the sheet metal attaches just below the gas tube. The first photo is one in the rifle.


DSC_0001_swThis is a different maker.

DSC_0003_swNotice the extended lips on the second picture verses the one still in the rifle.

In addition to drawing the part up a friend also did an analysis of the steel in the trunnion.

The specification for this part is C 0.45; P  0.044; S  0.039; Mn 0.62; Si 0.23; Ni 0.08

Hopefully after we finish the 10 projects that are on the mills now we can make a few for him.

As always comments and opinions are appreciated.

Monday follow up 9-15 work on the fab shop

I was able to accomplish a little more on the addition to the Fab shop. That is until we ran out of materials. Here are a few pictures of what little work that was accomplished on it. Just so you have an idea of the progression. This is me fighting with the compactor a while back trying to get the soil ready.IMG_2325_s

And when I was finally done with this fun task.


We did have a little rain here that helped settle it even more.

IMG_2343_sOver the period of two rain storms we had over 5″ of rain.

This is a little video of the water running around the fab shop.

Now it is on to the next exciting part setting the steel and the frame for the concrete pour.


DSC_0033_sI hope to be completed with the steel and framing by next weekend then pour in two weeks. We will see how well that plan works

Sunday Answer

The part this weekend is actually a complete bolt and bolt carrier for a Chauchat light machine gun. The pictures are from “Collector Grade Publications” book “Honor Bound”. This is another book that you should have in your library.

bolt 2_s

bolt 1_sOnce again comments and ideas are welcome.