03-15-2016, 09:55 PM
I think Silencerco makes a 9/16 x 24 back plate for the Harvester. I have one in 5/8 x 24 and I use the Precision Armament adapter that Brownells sells. I have them on a 1/2 x 28 .556 barrel and on my 16" Grendel. I ran one on my 20" Grendel with the Harvester and a TBAC 30P-1 with no issues. My new 20" barrel is 5/8 x 24. They are $23-$30.

