Push the release latch to extend the stock back as far as possible. Then, use a flathead screwdriver to lift up on the extension stop plate tab so that the stock can be fully removed from the rest of the assembly. The claw-like removal tool, included in the box, is needed to get the cheek riser moving.
Full Answer
Product Details
The UBR GEN2 is an adjustable stock for AR15/M4 and AR10/SR25 platforms, designed to offer similar strength and stability as a fixed stock with a consistent and comfortable cheek weld in any position.
Resources
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Does the UBR Gen2 have a ring?
This is also why there is a small aluminum ring included in the box with the UBR Gen2, that does not seem to fit anywhere. It is an adapter that will let castle nut wrenches fit the slightly smaller tube nut. After the main tube nut is tightened down, the cheek piece will slide back into place over the main tube.
Is the AR15 a fixed or collapsible?
Most of the ARs out there either fall into the fixed rifle variety or one of the variations of collapsible carbine style. Magpul’s UBR Gen2 was designed with the goal of getting the best of both stock types in a single system, so there would be a collapsible carbine stock with the durability and stability usually only found in the fixed rifle designs.
Do you need a buffer spacer for an A5?
The buffer spacer can be left out for those running an A5 buffer/spring setup, but most folks will need it. This is followed by the buffer spring and recoil buffer. The ASAP plate will fit over the buffer tube and sit flush with the back of the lower receiver.
