[url=www.Cheaperthandirt.com]Cheaper than dirt[/url] has them (they are DPMS). The one from shown from Bushmaster is their "heavy duty" one. Bushmaster also carried the newer RRA one that has a slot to remove the A2 buffer tube, which you may want to consider (they're only 8 bucks). If you check out the Equipment exchange, Billbo was selling them. He has a few ads in the Accessories and the AR parts sections.