Just a thought.

I am thinking of putting up a buy,sell, trade section on the blog. In it I will also post who is handling the parts we are selling and quantity left. I also have some stuff from my collection that I would like to sell. Any thoughts.

Cut away of the STg 45 rifle

I thought it was time for another cut away rifle that would be interesting. Most people never have the opportunity to see a STg45 much less the cut away version. Enjoy the pictures.

This is a picture of both the 06 and 06H (STG-45)


library3 390s

library3 389s

library3 391s

library3 388s

library3 387s

library3 386sThis is the first of the roller lock non gas operated rifles.


MP-44 trunnion part 2

The next machining operation has been completed on the trunnion. This is one of the many unexpected problems with reverse engineering a component.  The magazine did not fit. An error occurred that was missed. It is a good thing to check after every step which we do.

DSC_5953sYou can see the differences here and it is quite obvious. New measurements were taken and the trunnion was re-machined. These are the first two corrected trunnions that have been completed through operation 5.

In this picture you can see that the dimensions are a great deal closer. The thickness on the front of the magazine well are due to the new models not having a bevel put in yet.


DSC_5964sOnly the rough cut is accomplished in operation 5 on the under side below the barrel. It will be finished in operation 7.

DSC_5965sThe gas pistol supports.

DSC_5967sThis is the fit and finish in an original trunnion.

DSC_5974sour trunnion.

DSC_5973sdifferent angle of the same trunnion.

DSC_5972sThe first two with magazines in them. These are the minimum and maximum magazines that I own.


DSC_5969sWith the completion of operation 6 the magazine will set lower. With any luck operation 6 will be this week, however the HAAS team will be here Thursday for routine maintenance.

Making the VG1-5 cocking handle

Sunday was spent bending all the cocking handles for the VG1-5 project. These are the steps necessary to accomplish that task.

step 1


Step 2


step 3


step 4

DSC_5946csThe complete process.


This is the video taken to accomplish this part.


Reverse Engineering and machining the MP-44 trunnion

Here at Gun Lab we do a fair amount of reverse engineering, most of what we like to make have no drawings. However when there are drawings or solid models available we will use them. With this said I have found that most of what is available on the internet or in books is just not correct.

A case in point is the MP-44 trunnion. I have all the drawings that I have been able to find on this part, a number of different sets are out there, and when compared with the actual part have found them to be lacking. Some are just wrong and in some cases I don’t think the person has actually looked at a part.

Over at weapons man he had a write up about reverse engineering a while back.

It was a very interesting write up and I recommend reading it.

Now back to the MP-44 trunnion. We were contracted a while back with making a limited number of new trunnions  for the MP-44. He sent us a very good original one and we had a poor copy of one at the shop. Using these two pieces we started the project of reverse engineering it. The easiest thing to do was look for engineer drawings off the web. These are the ones that I found.

scan_Page_3 clean s

scan_Page_2 clean s

scan_Page_1 clean s

scan_Page_4 clean s

The measurements have been removed from these copies, however you can find them on the internet. I did use the basic drawing as a starting point. The sheets were cleaned and measurements were taken using a cmm, micrometers and  pin gauges. Tolerances were set using not only the trunnion but also matching parts. When there was a doubt other parts were located to increase the measurement standards. This allowed us to come up with a reasonable solid model that we felt was accurate enough to start programing.

MP-44 trunion5

MP-44 trunion3

MP-44 trunion1

MP-44 trunion2

MP-44 trunion4Even with this solid model and prior to making the parts we still caught a few errors that have been corrected.

Now comes the  portion of the project were we start working on the machining of the part. A master cam  programed was written to run the trunnion on the cnc machining center. It was determined that 7 set ups would have to be done to machine this part. This is a video of the master cam operation to complete operations 1 through 4.

With the program checked out we then ordered the proper tooling and set up all the off sets on the machine. Test material was brought in cut and machined to size to do a test run. This is the progress so far.The material was saw cut to size.

DSC_5384sThen machined to the proper size and squared.


The first 4 ops have been completed. Op 1 and 2 cut the groves on both sides and drilled the ejector holes.




The next phase was op 3 and 4.

The parts are set up in the vises ready to machineDSC_5894sThe barrel hole drilled and machined.

DSC_5904sThe hole for the bolt carrier is drilled, machined and then bored to a very nice finish.



DSC_5888sThe gas tube support is machined in.

DSC_5889sThe first six test pieces.

DSC_5898sEven now we are still not working on the actual parts. These are 6 test pieces that will be completed and set to the buyer to test on his kits to verify proper fit. In this case because of tolerances we went with a smaller bore diameter for the barrel fit, it is easier to remove metal then to add it.

Interesting gunsmithing video’s

This video is on barrel fluting. I enjoy watching gunsmithing video’s and happen to learn a great deal from them.

I like the way he dampened the vibration while cutting the flutes.

I am thinking AR-10 barrel when I watch this video

Pressing the AR-180B bolt hold open

Previously I showed a few pictures of the process in pressing the AR-180B bolt hold open device.

We started with a laser cut then machined blank.


This is the video showing the steps.

And after the pressing operation we have a completed part ready for heat treat.




Weekend update for 7-6-15

A number of projects were tackled this weekend, as always around here. First the comm trench was completed and 3 sets of cat 6 wiring was pulled.

DSC_5842sNext weekend I will bring it into the shop.

A small a/c unit was set up in the wood shop. It is not big enough but it does help keep the humidity down and makes it a little easier to work in there.

DSC_5843sPainted the wall of the wood shop that needed it. I also finished running the wiring for my wife’s office a/c unit. More work was completed on the cnc router frame. The plastic sides were installed and gasket material is being put in.

DSC_5844sI worked in the machine shop making a few video’s along the way. I have finished bending all the AR-180B bolt hold open bars.

DSC_5855sVideo a little later this week.


I also finished bending the fire control housing’s for the VG1-5.

DSC_5859sThere is a video on this as well.

What the completed box looks like.

DSC_5854sThe VG1-5 project is coming along and now with the AR-180 parts completed and going to heat treat we will be moving faster.

Update on the cnc router

In a past post you were shown a solid model picture of what the new base would look like.router table2

router table1

You were also shown a picture of the parts being milled to correct size.


Here are a few pictures of the parts after they were cut and tapped.

DSC_5836sThese are the legs and cross members.

DSC_5837sThis is how it currently looks put together.


DSC_5840sThe plastic covers for the computer section will be in tomorrow and will be installed.

DSC_5839sThe supports are made and will be installed soon.

DSC_5815sMore to come.

Week end update 6-29

It was an interesting weekend as are all weekends around here. I finished filling in the trench for the new communications lines to the shop. With the cat5 water proof wire coming in I should have this project finished next weekend.

The filled trench that I still need to compact. DSC_5825sThe water proof wiring.



With the pressure washer now operating I was able to clean out the inside of the coolant tank. A leak was found by the drain valve so it was loaded on to the truck and will be taken to the weld shop to be repaired.

The leaking drain valveDSC_5819sIn the truck ready to go to the weld shop




The wiring has been run for my wife’s office A/C unit.


I made parts for the AR-180B project, trying to get everything off the machines. I have a video to post on that later in the week.

All the AR-180B bolt hold opens are machined. I will bend them this week and then off to heat treat.DSC_5832s

And last but not least. Tub after tub of parts were de-burred. I still have more VG1-5 parts to finish de-burring.

FG42 first model rear sight bases

DSC_5830sVG1-5 rear sights

DSC_5829sVG1-5 trigger guards

DSC_5828sVG1-5 parts and AR-180B parts