I did call Barrett and asked them about the Monopod. They said my gun was built on January 2019 and the Monopod fits all the newer rifles. I searched for 2 days and the cheapest believe it or not was Midway USA with a free shipping discount code. When I got it I looked at it trying to figure out how it was $129?. I really like shooting the Barrett with it because once you get it set it is really easy for follow up shots.
The one item I am having a really hard time with is finding a sunshade for my Burris Fullfield 2, 4.5-14x42 scope. I can not find it at all and have it on order with Optics planet but they say it may be a month before they get them in. I am thinking about just ordering a super sniper off of Amazon and putting the Burris on something else. The only reason I want a Sunshade is to make the scope bigger because the M99 is so large. I am really liking that gun.