I'm working on cutting down the standard field stock for my M4 (thanks for the hardware deal, flyfishdave). But in the meantime, I hacked up a short Speedfeed stock for the M1S90, to fit my M4. I like it a lot for a pistol grip, but I want an extended magazine, so back to the standard stock I'll go.

If only speedfeed would make an M4 stock...