Suppressor for Grendel came in

[Variable]

Back at the beginning — I wanna say 2004 —AA's sniper-style rifles were threaded 3/4x28. It would have been their GDMR model. Bill A. did this to have as much meat at the muzzle as possible.

Except----- If you were a stingy and wise grasshopper, you could order the 19.5" Hunter upper with the same barrel. Then build your own GDMR for less money with the rail of your choice.