Les Baer says his ar15 Grendel cannot handle a suppressor?

[Asahi1234]

Les Baer offered 6.5 Grendel long before he developed the 264 calibre. I heard Les and Alexander Arms had a parting of ways. Don't know why. Then later Les came out with the 264. I have had my Les Baer 6.5 Grendel since new for about 5 years. Shouts 1/4 inch groups at 100yards. I will add a adjustable gal block before I use the suppressor.