Re: Hope someone can help, LOP on AR15 help.
RRA has a laminated stock kit for the AR-15 I put one on the wife's (she's 6'3") It has a full recoil pad, and seems longer than a standard A2 stock. I didn't measure it, so can't tell you the inches.
I have a feeling, that if you tried the butstock extender with the 2" spacers and the longer screw, then you've prettywell maxed out the length of any conventional stocking of the AR15.
Some of the colapsible stocks should get out to 13" or nearly there, and then there are slip on recoil pads that should get you close to another inch.
There are only two seasons: Hunting season, and Getting Ready for Hunting season. -DAD