I picked up a Magpul MOE SL AR15 rifle stock.  SL stands for "slim line" and it definitely is slimmer.  I believe (though I am not certain) this is Magpul's competitor to the new BCM stock that recently came out.  While I am a big fan of BCM, I went with the SL to review.  The stock has a very solid fit and positive retention on the PWS enhanced buffer tube.