Ok-have used the search function and found a few Sabre threads on barrels and uppers all seems good to go. (A couple on the Sabre Bench rifle also) But there is very little on this new (i say new its been out a couple years) Marksman Rifle- anyone out there own one? Still searching for my next AR.
http://www.sabredefence.com/products.php#products/pmr
http://www.sabredefence.com/products.php#products/pmr