A few months back, I received my Canada Ammo Dominion Arms 50 BMG upper and Alberta Tactical Rifle Systems lower in the mail. Earlier in the year around March, ATRS advertised they were going to design and build their own non-restricted single shot lower for the DA-50 upper and permanently modify the DA50 upper so that it could never mount to a standard AR lower again, I decided to pounce on the offer.
The Dominion Arms 50 BMG (DA50) upper, would normally mount to a standard AR-15 lower, however, if I had gone this route, I would have required me to register the rifle as it would have been a restricted firearm. Since ATRS was going to put out there own lower and the modification work, I paid for the upper and had it shipped to ATRS once they were back in stock around May of 2016. With the upper, the cost was around $2000 after tax, the lower added about another $1000 as well as a trigger package, 50 MOA rail and shipping, the total cost of the rifle was around $3250 out of my pocket. Not bad for a entry level 50 BMG rifle that didn't look like one made by Canstar.
However, when I received the rifle, there was a concern the chamber was undercut for the 50 BMG and rounds wouldn't chamber, both Canada Ammo and ATRS reached out to me to notify me of the potential issue, and asked that I perform a test chamber of a round to ensure that there were no issues. In this video, it's a test chamber of 2 rounds as well as firing two shots to ensure there were no issues. I didn't release this video back in June as I was waiting for a day to show up at the range with my Buddy Roland so I could "Surprise Him" in a good way with my latest purchase. I had it out to a buddies farm the other day and I think he was surprised. A range video is pending where I put the optics that I wanted on it (a Vortex PST 6-24x40 FFP MOA scope) hopefully in the next few weeks.