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If you're installing a standard A2 style buttstock on an AR-15, you'll need to add a spacer to the buffer tube.
Buffer tube spacer
The takedown pin is also installed at this time as the spring and detent are held in place by the buttstock. Apply a little oil to the takedown pin and push it into the lower from the right side. Install the detent from the rear end followed by the spring, which should protrude slightly. Slide the buttstock over the buffer tube being careful not to bend the detent spring.
Install detent pin
Insert the spring over the detent pin
Secure the buttstock over the buffer tube
Now secure the butt plate to the stock.
That completes the installation of the buttstock.
-- Larry Potterfield
