|
It appears that “DIY self defense”,(http://diyselfdefense.tumblr.com/) has gone off the air. It was a great site and he had cool stuff that he found and posted. It and Improv Guns (https://homemadeguns.wordpress.com/) were the only sites that dealt with home made firearms. I have always found it interesting what people can come up with when weapons are outlawed by their government. I will miss his site. Looking for G-43 fire control parts. Hammer,trigger,sear. This is for one of the projects we are working on. A friend of Gun Lab has helped out with this. Thanks In my list of want to do build projects building an original FAL is on the top. The very first FAL ever built was in 7.92×33 and was slightly different then the current FAL that we know today.
This is Pete’s , a friend of Gun Lab, version of a 7.92×33 rifle. His solution was to put in a new ejector block of his design with a spring loaded ejector. Then remove 0.900″ from the magazine to fit the 7.92×33 round.
A side view of Pete’s rifle. Notice the larger then normal ejector block.
You can see in this picture the fit on the magazine to the receiver.
You can see here how the cartridges set in the magazine.
This his new follower
A top view of the spring loaded ejector
Rick from http://ar180s.com/ dropped by yesterday and spent a few hours at Gun Lab. It was a nice visit. We both got to show off projects that we have been working on. I was able to get an up close look at his shorty project and his machined out of tubing AR-180 upper. Nice work. The shorty projects looks like a fun build. Now to go back to the salt mine of my shop for today. Looking forward to your next visit. An interesting question was brought up by Rick at http://ar180s.com/ a while back about making new AR-180B upper receivers. The actual receiver is not much of a problem however the trunnion is. The expense of making a new trunnion would be cost prohibitive so a different solution had to be found. In this case the thought would be to do what was done, or thought to be done by Armalite and that is using an AR-15 barrel extension pressed into a new trunnion block. So looking at a AR-180B we can see what the trunnion looks like in a receiver.
There are a number of differences. The original is forged and then machined. You can see how the boss sticks out in front of the bolt locking area. While the 180B the rear of the trunnion is flush. The reasons for these differences is because a AR-180b does use a AR-15 barrel extension pressed in. However there are changes to the barrel extension. In this hidden view you can see that a AR-15 barrel extension would be to large for a trunnion as originally designed for an AR-180
This can only work if the trunnion is also re-design. This is what Armalite did for the AR-180B.
As you can see in this cut away the reduced size of the outer ring of the barrel extension. In this picture you can see the hole for the guide pin on an AR-15 barrel extension.
Op 7 has been completed. This is a major mill stone on making the MP-44 trunnions. The rest of the machining will be done on the manual mill. It will be easier on the manual mill then making the number of fixtures and tooling that would be required on the cnc machining center. This is op 7. You can see the original next to one of ours. The manual phase will add the chamfer to the groves.
Operation 6 has been completed on the MP-44 trunnions. A couple of problems were noted. The first is the difference in length on the front of the trunnions and the second was the fit up of the locking shoulder. This photo shows the difference in the lengths
This last weekend was a busy one, like most weekends here. On the list of projects that had to be completed was get the parts ready for heat treating. This meant bead blasting all the parts going to heat treat. Not a weekend of fun and frolic. Thousands of parts needed to be cleaned and prepped. The though of cleaning them one at a time did not make for a project that I wanted to do. I have been looking at rotating parts bins for my bead blaster but have not had much luck. I knew a simple solution had to be out there, This is a video I saw on the net that I felt would be a long term solution, but for now something quick and simple.
So I made a manually operated rotating tumbler for the bead blaster. Here is a quick video of it and using it.
The first attempt was a 3lb plastic coffee can and just rolling it around.
I needed something that was a little easier to use and could hold a few more parts. So I made one out of a 1 gallon bucket and some old castors.
This is what the rusty bolts looked like starting.
We have finished operation 6 on the MP-44 trunnions. The reason that we started with 6 samples was to insure that we would have correct samples when we finished. Two of the trunnions ended up out of spec after we finished this operation. The drawings and cam programing were changed to correct and problems. These are the pictures of the remaining 4 on there was to op. 7.
We have just completed the first operation 6 on the trunnion. It has also pointed out a few minor differences. When we started this project all we had was an original trunnion in very bad condition and a collection of out of spec drawings with incorrect dimensions.
Later a trunnion in very good condition showed up from a friend to help move this project along.
So as we have gone through each step of the process of reverse engineering a MP-44 trunnion and making a series of them we correct our solid model and it’s dimensions have rewritten and the machining program changed as well. This is the trunnion as completed on the first sample of op.6. There is a great deal that is correct with this sample, however there are more changes to be made. The top radius for the gas tube needs to be looked at.
|
||
|
Copyright © 2026 GunLab (KnownHost) - All Rights Reserved Powered by WordPress & Atahualpa |
||
