GunLab

PTR44 locking shoulder damage

Pete, a friend of gun lab, Sent me some pictures of a rifle that has come into his shop for repair. When he tool it apart and check out all the components he notice the condition of the locking shoulder. In the following pictures you can see the damage that has occurred to the PTR-44 locking shoulder.

It is hard to determine if the position of the bolt was not properly lock it up. It looks to be to high. This could have been a problem with the parts as they were made, out of speck, or it could be a problem that has occurred over time and usage.

Pete ran a file over the locking shoulder and it did not scratch it, a sign that it is hard. It could be improper material and or heat treat of the material.

Just be warned and check out your own weapons to verify the condition.

Cut away Bren gun

Just a quick post and a late one at that. I am a big fan of cut away guns as a learning tool. This is one of a bren gun I looked at while on one of my trips overseas.

A close up of the receiver area

A close up of the piston

Building the semi auto MP-44 part 4

This post deals with just one of the small stampings that goes into making a MP-44. he part being make for this post is the sheet metal reinforcement for the back of the magazine well. This simple part closes the rear of the magazine well, strengthens the rear of the magazine well, addes extra support for the magazine catch area and provides a guide for the magazine.

This is what the part looked like after being removed from a torch cut receiver. There is not much there that is useful, however with a little work a new part can be made.

The first step is to measure out the part and then design a female stamping die that will meet the contours of the part.

Once verified it is time to move onto the next part

In this case the next part is the male die. As this process is being accomplished a number of stampings are done.Generally nothing happens correctly the first time.

Now the die is added to. The complexity of the die either requires a cnc machine to make it or a fabricated die has to be made. Due to the lack of cnc yhe die was pieced together to form the required shape.

After the stamping dies are completed then it is time to work out through trial and error the proper shape of the blank.

Not comes the moment of truth. If everything works properly then a good part will be made.

It took a great deal of work to design and make the press tools that were necessary to make just one simple part.

Working on the CNC router

A great deal of work went on this weekend and part of it was some work on the cnc router’

No, it is not up and running yet, however some of the components that were ordered finally arrived and we were able to start working on it again. The bad news is that some of the items we did order are not the correct parts that we needed.

The majority of work completed was minor as well as a number of solid models were drawn to start making our own parts.

As is always the case in any shop it needed to be cleaned off first so it could be worked on.

Next the control panel was mounted in place.

All the limit switches were made from bent pieces of sheet metal and needed to be replaced.

Aluminum angle was cut and drilled then mounted to support the limit switches.

Aluminum angle stops were installed as well

Simple things were accomplished. A number of drawings were completed in solid works to start generating the necessary drawings so to allow me to machine the new side panel and connector adapter.

More work will be completed this next weekend, hopefully the rest of the material will be here.

Hakim Cut away rifle

With the gun room cleaned up I am now able to get access to some of the reference collection. This post is about the Egyptian Hakim cut away rifle.

This next series of pictures deals with the receiver and magazine

The cut away area of the gas port area

A close up of the gas port area

A cut away of the barrel

A close up of the chamber area

The

Right side of receiver

The top of the receiver with the slide back

A llok at the slide

The safety

rear sight

If any one has a cut away weapon they would like to share please drop me a line.

The MG-09 light machinegun

In answering question concerning the post on the AR-10 belt fed light machine gun Ihave spent some time going through the ” The Armalite AR-10″ book. On page 314 of the book is a picture of a MG-09 light machine gun. The funny thing is that I had just seem that same weapon. It was on my back up hard drive and it was in a file of pictures of weapons that I had taken a while back. I had no idea what the weapon was, but that it just looked interesting so I snapped a few pictures of it.

This weapon bears a close resemblance to the T44 light machine gun designed by the United States after WW2.

These are the pictures I have of the MG-09. If you read the section in the book on page 313 and 314 it answers a few questions on the weapon.

A right side view

Left side view

A close up right side view of this weapon

The left side of the weapon with the side cover open

A close up view of the feed system.

The feed cover assembly looks like a very simplified version of a cross between a MG-34 and MG-42 top cover. An interesting design that never got beyond a working non firing mock up. Mock ups like cut away guns are a great way to study small arms design.

AR-10 belt fed

Got tied up so just a quick basic post. On my last trip overseas I was able to snap a few shots of a belt fed AR-10 receiver so I thought I would share them with you.

This is a stock photo of the complete weapon.

This shows it open.

These are the photos that I took of the receiver area.

Just a couple of close up photos

For more great information on early AR-10 rifles pick up a copy of the new book “The Armalite AR-10″ from Collector Grade Publications.

More work in the gun room

This weekend was again spent trying to make and install new gun racks for the gun room. Not as much work was accomplished as was hope for, a number for friends showed up with interesting and fun toys to play with and take pictures of. In addition it was my fathers 93 birthday and time was spent with him. I did manage to finish out three more gun racks and moved all the guns in the kitchen and living room back into the gun room.

I happen to like the Martini-Henry rifle and have a couple of them. So, I had a little space by the closet door and thought it would be a great spot for some of them.

This gives you a better over all idea of the space I had available.

I then built the larger gun rack at the end of the room.

Finally I re-hung some older racks that I took down for the sub-machine gun and semi auto carbines

The last of the racks will be built hopefully next weekend.

The next step on the MP-44 trunion

Not that we have finished running the parts on the machining centers it is time to do the final fit up. Using the 1018 trunions that we made a hole was drilled in it to allow alignment with the button pressed into the receiver. Then the blocks were tested to see if the fit up was correct.

This is how the trunion looks away from the receiver.

As it sets into the receiver

An angle view at the rear of the trunion for proper fit up there.

A look at the front

Another at a slight angle.

Some de-buring still needs to take place and we still have a few cuts to do on the manual mill. If you are interested in any new MP-44 trunions please drop me a note and I will get the request to Pete.