MA5K build ver2 Part 6
Ok at this stage of the build we take the pep part of the build and use some spot putty to go over the jointed areas like so. It’s best to work with spot putty outside while wearing a respirator, be safe.
Now we will focus on the moveable action/ barrel assembly of this build. This is the hardest part of the build so far. First off we start with the raw materials.
½” X 36” 16ga sidewall steel tubing
3/4” X 36” 16ga sidewall steel tubing
3/8” X 36” hot rolled steel rod
Compression spring to fit over 3/8” rot rolled steel rod
1/8” roll pins
3/8” black pipe nipple as short as possible
http://i255.photobucket.com/albums/hh155/S...n161/nipple.jpg
3/8” black pipe coupling
http://i255.photobucket.com/albums/hh155/S.../38coupling.jpg
I managed to get all of these raw materials at my local Tractor supply company. Lacking that you can always try your local hardware or home improvement store.
Ok next I cut a section of ½” tubing 15” long. This will be my main barrel.
The next steps are only important if you want to have a threaded barrel to attach a fake suppressor to. I realize these steps are beyond the resources of many members. My best advice is if you want this threaded barrel you can always find someone with a lathe and talk them into doing it for you. Also I don’t have many pictures for this section during the lathe work, I will add some later. So with that said onto the build.
Then I took the pipe nipple and coupling, screwed them together and then chucked them up into my lathe. I turned down the surface of the coupling until it was smooth. Then I knurled the surface of it. Then I cut it in half and squared up the ends. This is my barrel nut painted flat black
http://i255.photobucket.com/albums/hh155/S...1/Barrelnut.jpg
Next we take the pipe nipple and bore it out with a drill bit so that the ½” steel tubing fits inside it like so. Measuring from the back of the threads to the front of the tubing we want 2 ½” of build to protrude from the end of the pep build. Then we silver solder these threads to the tubing, clean it up and end up with a barrel looking like this.
http://i255.photobucket.com/albums/hh155/S...61/IMG_7698.jpg
Then we take the 3/8” X 36” hot rolled steel rod and cut a piece 10” long. This we insert this piece into the back (opposite side away from the barrel threading and nut) of the barrel until only 9 ½” is showing. Then we measure back ¼” from the barrel lip and drill an 1/8” hole through the barrel tubing and 3/8” hot rolled rod. Insert a 1/8” roll pin, cut to fit and finish area with a steel file.
Then we cut a 3” section of the ½” X 36” 16ga sidewall steel tubing. This is the main part of the action. We then cut a channel into the steel with a dremel. Then I cut a piece of sheet metal and attached it to the front of this piece with some screws. In hind sight I should have just welded it together. Then I drilled a small hole into it, this is the charging handle. Then I made a charging handle out of sculpy and attached it like so.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8472.jpg
Then I cut a 3 ¾” section of the 3/4” X 36” 16ga sidewall steel tubing. Cut some tabs out of sheet metal and welded it together. Pictured below with the sculpy bolt. This is the entire bolt carrier assembly
http://i255.photobucket.com/albums/hh155/S...61/IMG_8478.jpg
Next we slide the bolt carrier assembly onto the 3/8” rod area of the barrel assembly all the way to where it buts up against the barrel. We use a sharpie to make out the area on the 3/8” rod that shows the travel area of the action. Then we drill a 1/8” hole part way through the 3/8” rod. Insert a roll pin. Now we have the action with a pin in it that limits its travel. Now we slide on the spring and trim it appropriately. Then we cut a 1” piece of ½” X 36” 16ga sidewall steel tubing. Slide it onto the back of the barrel assembly against the spring. Drill an 1/8” hole all the way through this insert a roll pin and trim to fit. Now we have the assembled action mostly done. Looking something like this.
Assorted parts disassembled
http://i255.photobucket.com/albums/hh155/S...61/IMG_8509.jpg
Now we take the barrel assembly lay it against the pep build and lay out the lines for the charging handle cut out. Then we cut out the hole with a sharp blade and finish the hole with some small files.
Now we disassemble the action. Take the sculpy bolt carrier and round out the back side of it with a dremel and sand paper until it fits flush against the ¾” surface of the steel like so.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8478.jpg
Then we insert the barrel with the 3/8” rod still attached into the pep build. When it gets back to the rear receiver we slide on the bolt carrier. We then line up the sculpy bolt with the ejection window and tape it in place like so.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8476.jpg
Top view
http://i255.photobucket.com/albums/hh155/S...61/IMG_8475.jpg
Now we take the bolt carrier and barrel out of the pep build. Take the bolt carrier with the sculpy bolt still taped to it and super glue it in place. Remove the tape, take some spot putty and go along the top and bottom of the sculpy bolt. Once it is set up will have a part view like below.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8480.jpg
Then we sand it down and prime it.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8481.jpg
Then paint it flat black
http://i255.photobucket.com/albums/hh155/S...61/IMG_8482.jpg
Now while that is drying we take the barrel cover the threads with masking tape and paint it with your color choice. I used Rustoleum Hammered black
http://i255.photobucket.com/albums/hh155/S...61/IMG_8512.jpg
After it is dry slide the barrel assembly into the pep build. Adding the bolt carrier spring and other parts once it gets to the back and check for fit. Modify where needed to insure smooth movement. Here is the charging handle side, note the lines drawn on the pep. This is the area I have to cut out to accommodate the full travel of the action.
http://i255.photobucket.com/albums/hh155/S...61/IMG_8474.jpg
Please read this carefully. If you have questions please do not quote this entire post. Just copy and paste the relevant area. I will do my best to clear up any questions you may have before continuing with this tutorial. Let’s keep this thread as orderly as possible. Thank you for your cooperation.