Quoted: Put on some gloves.
Orient the rifle vertically, with the muzzle up. Dominant hand pulls back on the charging handle, other hand on the handguards. As you're pulling on the chaging handle, SLAM the buttstock into the ground with your other hand.
Don't be shy, treat your gun like the tool it is.
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This is the fast way to clear a stuck case. As Hoplophile points out, there's a possibility that your rifle will end up needing new parts afterwards. I've wondered how well a cast lower will stand up to this kind of treatment. Of course, if you're being shot at and your rifle jams, being able to return fire in short order with a damaged but servicable weapon is much more important than maintaining your weapon's appearance. But this is a primarily civilian forum, how many of us have actually been shot at?
Quoted: I'm going to advise against this.
The casing was removed by seperating the upper and lower (you'll have to work at it to get the carrier to clear the hammer and the bolt stop but it will slide out and to the front) then just insert a flat-head between the end of the bolt carrier and the end of the barrel extension and slowly pry them apart. once it's loose the carrier will come right out and you can put it all back together.
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You'll have to remove both takedown pins, lift up the front end first, then slide the upper forward off of the lower. The bolt carrier will still be inside of the buffer tube, so you won't be able to just take out the back pin and flip up the rear of the upper .
If you don't feel like taking the rifle apart, find a nice strong piece of hardwood and jam it between the bolt carrier and the front of the ejection port. Pry back on the bolt carrier there. Just don't use a metal screwdriver like this, you'll at least gank the finish around the ejection port, and you might end up denting it well. This is a lesson I learned after I'd put my first AR together and the cosmolene all over the bolt, bolt carrier, and inside of the upper receiver caused the bolt to hang up on ejection.