We (Fidelis Arms) make a true 20 round magazine for the 308 that is fully DPMS compatible. You can view them and see a full sized image at:
.308 20 round Magazine
The magazines have a stainless steel anti-tilt follwer. If you would like pricing and availability send me an email at Chris@fidelisarms.com
I do not know if anyone makes a braided stainless steel spring 308 magazine currently. If you are looking for something you can leave loaded indefinately that is what you would want to look for.
www.fidelisarms.com - custom lowers for ar style platform. Uppers, ammo, ect. Click on contact us and shoot me an email with any questions.
Last edited by Chris@fidelisarms; 10-07-2009 at 06:43 PM.