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I like the Grizzly Big Boar, go to 50bmg.com and they have them in stock for 2495, bullpup design with a 36 inch barrel, overall length under 46 inches. Armalite is 3195 with a 31 inch barrel and overall length of almost 60 inches. Look at them side by side and my money is on the Griz. The Armalite is also 10 lbs heavier.
I googled Grizzly Big Boar failures and nothing came up except their typical(for all guns) waiver saying if the gun is improperly cared for it can explode. but so can a 1911 45. The grizzly Big boar is one you can buy the plans for to build in a small machine shop. I can imagine dangerous ones being out there made by someone that grabbed a chunk of steel and started milling away. Regarding the bolt and receiver, they are one of the heaviest made for a 50 caliber single shot rifle. BUT the steel HAS TO BE MADE OUT OF THE PROPER X-RAY SPEC STEEL. If there are any microscopic cracks in your bar stock they could fail. So make sure the Grizzly you purchase is one made by the factory, or made by someone who knows specifically that the receiver/bolt HAS to be made out of very special very expensive steel and you should be good