Not really new Magpul PTS products, but if you're looking for these, the black and foliage green colours are now in stock at Get Reload for US$62.00 each. These are for M4/M16 AEGs and can readily fit the stock tube. This is the simplified version of the Magpul CTR stock and it includes a rubber butt pad and side mounting for cheek pads.

MAGPUL PTS CTR Carbine Stock With Lock (Black)

MAGPUL PTS MOE Carbine Stock (Foliage Green)