I like to use sniper rifle in MGS:V , sadly M82A1 rifle is not available in the game.
Either that or I haven’t found its blueprint yet. I did missed a few blueprints in mission. Some of the quest requires you to finish every tasks which might be a bit hard at times.
Unlike PC, I never bother using cheats on PS4.
M82A1 here is developed and manufactured by American Barrett Firearms Manufacturing company. It was founded by Ronnie Barrett who is a semi-auto rifle otaku. He adores semi-rifle so much that he opened up his own weapon factory and designs all the weapon personally.
M82A1 is an adult crafts and is a hard paper craft to build.