Magpul UBR install guide and pictorial review

[Stickman]

Before starting, basic weapon safety needs to be followed. Clear your weapon, and ensure there is no ammunition in the chamber, and no magazine inserted. I hate to bring it up in each writeup, but safety is something that can’t be overlooked. All standard disclaimers apply here. This is an illustrated example of how I remove, install, and use items. If the use of basic tools is something you fear, find help before attempting any weapon work. Weapons are inherently dangerous, and so are tools if not used properly. While these steps work for me, it is not a magic answer for everyone. The use of the below steps still obligates the reader to accept responsibility for what they do.


With a safe weapon, push out your take down pins, and remove the upper from the lower. Next, we need to remove the stock. If you have a fixed stock (A1/ A2), take a look at the upper screw on the buttstock. This needs to be unscrewed and removed. After the screw is removed, the stock will pull off with direct pressure to the rear. When you remove the stock, there will be a spring and detent (spring shown in the below picture). The spring keeps pressure on the detent, so make sure you don't lose those pieces.




If you are removing a carbine receiver extension, use a stock wrench and loosen it applying pressure counter clockwise. Some companies, mainly RRA, use a threadlocker so heat may be an aid to removal. If your castle nut is staked, you will need to brace the lower receiver or grab a friend to help hold it down.