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.