one of the two oldest 50 designs in a single shot is State Arms and it has a 2 lug bolt and it will eat anything(most of it life it has been fed MG loads) it is built like a tank, mine is an M- series i have used for over 27 years , i have burned more barrels out than a would fill a pickup bed to the top and the springs collapsed and trashed more than a dumpster load of scopes (before scopes were made with long eye relief and able to stand up to the 500G+- loading)and in 27 years i have not replaced one part of the action/trigger Klause Horstkamp was the designer/builder and a close friend of mine until his death in 2000 ,if i needed any thing anywhere in the world he would ship it to me before he even recieved payment
to this very day State Arms/East Ridge still uses the two lug bolt as do the Very pricey BAT actions
my concern with the Bohicia is that the reciever is investment cast not milled out of a solid block like the SA and BAT actions
as for uppers ALS ,Ferret are superb(match grade) and the Ultra Mag 50 is good but it is not match grade
the ALS is a two lug bolt the Ferret is a 3 lug and so is the Ultra Mag ,Serbu,EDM,Anzio,ect.
there is nothing wrong with the two lug design