Installing Gear Drive 308 Semi
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“How To Assemble an AR-10, 308 AR Upper” Tutorial with Detailed Pictures and Explanations Build a DPMS LR-308 Upper Receiver with Free Float Handguard Below is the steps taken for assembling the DPMS LR-308 Upper Receiver in the project. Tools Needed to Assemble an AR-10 308 AR Upper Receiver Tools: Click the links below for more info and purchasing sources. Barrel Nut Wrench – The barrel nut wrench is specific to the upper and handguard being utilized. Torque Wrench (optional).
Parts Required to Assemble an AR-10, AR-308 Upper Receiver. Grease reciever threads for barrel nut installation Step 5 – Torque AR-10, AR-308 Barrel Nut and Align Gas Tube Here’s the part where a bench vise must be used. The DPMS claw needs to be placed very securely in the vise as it takes a fair amount of force to tighten the barrel nut the correct amount while maintaining proper alignment for the gas tube. The general idea with tightening the barrel nut is not to tighten it all in one shot but rather tighten it in three or four attempts.
Installing Gear Drive 308 Semi Auto
With each attempt you will tighten, back off and tighten again getting the barrel nut to rotate a little farther and tighter with each attempt. You will notice that the barrel nut holes most likely do not line up with the hole in the upper receiver for the gas tube. This is a good thing. Your final step is to tighten the barrel nut one last time and align the nut so the gas tube can fit through the barrel nut and into the receiver. Basically you need to rotate to the next hole carefully stopping when the barrel not hole aligns with the gas tube hole in the receiver.
Most folks use the gas tube testing for alignment as they go. I use a drill blank the correct diameter. I find it less awkward to use then the gas tube. Because of the very short handle on my wrench I had to use a hammer to gently tap the barrel nut into position.
Note: There is torque specification. If your using a different barrel nut and a wrench that allow the attaching of a torque wrench use the above procedure and stay within the correct torque range. Also the length of your wrench significantly affects the amount of torque you are applying to the barrel nut. The longer the wrench the more torque you will be able to apply with less physical force.
Don’t over tighten the nut or you can damage the receiver and possibly yourself. DPMS LR-308 Gas Tube Installation Step 7 – Install 308 AR Front Sight Gas Block This is another very easy step. The most important item to be concerned with is the orientation of the holes in the gas tube. The gas tube contains three holes. One hole aligns with the hole in the barrel. That hole is how the gas is able to get into the tube to assist with cycling the rifle.
The other two holes will be aligned to each other horizontally. These two holes are for the roll pin the captures the gas tube within the gas block. DPMS LR-308 Gas Block Carefully slide the assembled gas block over the barrel. Notice are barrel has two small conical recesses machined into it.
Installing Gear Drive 308 Semi Rifle
Those recesses are for the gas block set screws. They serve to lock the gas block in place and prevent it from rotating.
The gas block will stop at the correct location due to the point where the barrel is a larger diameter. At this point I turn the upper receiver upside down so the picatinny on the upper and the gas block are resting on a perfectly flat surface.
This aligns them perfectly to the same plane. Then carefully tighten the two set screws being careful not to move the gas block.