From Magpul PTS (and also mentioned in the news forums):
Dear All,
We are please to announced that Magpul PTS going to release MOE Vertical Grip (MVG) and Rail Vertical Grip in May 2010. The product information as follow:
MVG
Designed for use with MOE and ACR™ (Adaptive Combat Rifle) Hand Guards, the MVG is a basic, light weight, cost-effective vertical fore grip that attaches directly to these hand guards without any rail needed. Shape is ergonomically designed for use as a traditional vertical grip. It has also been optimized for use with the "thumb break method" of shooting as taught by Magpul Dynamics.SM.
All mounting hardware included.
RVG
Designed for use with milspec 1913 Picatinny rail hand guards, the RVG is a basic, light weight, cost-effective vertical fore grip. Shape is ergonomically designed for use as a traditional vertical grip. It has also been optimized for use with the "thumb break method" of shooting as taught by Magpul Dynamics.
Includes a custom fitted universal mounting rail and all mounting hardware.
Regards, (Magpul PTS)