07-10-2011, 06:19 PM
davidj Wrote:It is an old SP-1 . It has functioned flawlessly in .223 mode (still does).Well, sounds like something is up with that Grendel gas system.
I should add this is a Bill Wylde build with a Kreiger Barrel so the .223 upper isn't really a SP-1 anymore.
Do you know what your gas port size is ?
http://www.65grendel.com/forum/showthrea...-port-size
Before doing anything with my gas port I would try a CAR buffer and the lightest carrier that I could find/borrow.