![]() Use the same method you did for the front trunnion to do this step. The rear trunnion will need to be removed from its half of the cut receiver. Two, it prevents the receiver from twisting during handling or firing. One is that it prevents the hammer from striking and bending/breaking the ejector. This tube is very important for the safe use of your rifle. Most of my kits did use a tube 1.177” long. Only you will know what will work for your kit and bent flat. The two walls of the bent receiver should be perpendicular and show no signs of forming a “Y “shape. I have seen front support tubes 1.177” long, 1.450” long, and 1.090” long. Each bent flat will very slightly and will need to be hand fitted. You will have to cut/grind down the two upper rails to allow free movement of your bolt carrier and mount the top cover. The makers of the flats and some of the companies say that the total distance of the inside, receiver wall to receiver wall, taking into account the thickness of the two lower rails is to be 1.250” This number is just a general number to keep in the back of your mind. There is much discussion on just what is the proper length of the front support tube that sets the width of the inside of the receiver. You have now mounted the trigger guard and magazine catch. You may need to adjust the crush plates to get an even crush on the rivet shank. The rear trigger guard hole will be done the same way. The rivets will crush and pull in all of the parts tightly onto the receiver. You align all the parts, making sure the safety stop plate is on the right side facing up, insert the rivets through all the holes and parts, set the crush plates, double check every thing, and start pumping. The jig will allow you to crush four rivets at one time. The jig comes with a pair of small metal plates that will crush the rivets in the triggers corners. I am using a Harbor Freight 12 ton press. You should have the trigger guard, a spacer plate with a bent metal tab on it, and maybe an inside rivet retainer (under folder) the jig I am using requires a hydraulic press or a steady rest and a heavy hammer. First off, inventory all of the trigger guard parts. If you don’t have one you will need to make a single rivet setter and crush punch. There are jigs you can buy to allow this step to be done easily. We now need to mount the trigger guard and magazine catch assembly. Bending the two lower rails up/down slightly may need to be done to aid alignment. Double check the two lowers rails and make sure the bolt and carrier will move and lock up with little force. You have now mounted the front barrel trunnion. Same goes with the lower short rivets, they must be below flush. If the rivets are not below flush, you will not be able to mount the barrel in the trunnion.Ĭontinue with the other five rivets. If you cannot do this on the first crush, adjust the tong tool to allow you to do this. ![]() The trunnions have a recess to allow the crushed rivet to be slightly below flush. Apply a constant force on the rivet and it will crush and bring the parts together tightly. Make sure the back jaw in on the exposed shank of the rivet you are setting. Using the milled tong tool jaw, place pressure on this jaw to keep the rivet flush with the side of the receiver. Use a drift punch to align the holes and install one rivet into the upper holes. Setting the rivets is easy but can be improperly done if not careful. The top holes take the four ½” long rivets the two lower holes take the short 3/8” long rivets. Once you have done this, the front trunnion can be riveted into place. You need to remove excess metal from the top rails but leave just a very slight radius that will fill the female slots. The front trunnion has two female grooves cut into the trunnions sides that will hold the top of the receiver’s side rails. A Dremmel tool with thin cut-off wheels is easy to do, a milling machine would be ideal. All the receiver flats are made oversize and require these steps. The receiver has to be trimmed to fit both trunnions and has to be bone by hand fitting.
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