Mega Arms recently announced that they are shipping their new MATEN/.308 SL4000 Slide Lock Ambi Charging Handle. This ambidextrous charging handle is the big brother to the 5.56 version that has been out for a little while. The Slide Lock does not require a latch to be pulled to release the charging handle and features what I believe to be the least amount of moving parts for any charging handle, ambidextrous or not.
The Slide Lock is made from 7075-T651 Billet Aluminum with a black Nitrated latch and is compatible with any .308/Large Frame, Semi Auto Upper Receiver.
For more information, check out the Mega Arms webpage at:
MSRP is $68.00. Rainier Arms does not have it up on their page for sale quite yet, but keep an eye out for it to drop soon.