I have seen this happen, usually due some one monkeying with trigger adjustment, can happen on 1911's too. When ever you get a new gun with a manual safety, make sure it is unloaded, engage the safety, point it in safe direction, pull the trigger hard!! Then still in a safe direction, disengage the safety, many 700's will go bang with and improperly adjusted trigger, if it passes that test, operate the bolt and make sure you slam it home hard, see if the trigger and sear stay engaged, final test, once again, safe direction, on a carpeted floor or a piece of rubber, pound the rifle butt on the ground and see if the sear stays engaged. Most 700's should not be adjusted below 2.5 lbs, especially if you shoot in the summer and hunt in the winter and extreme temperature changed, 2.5 may be 100% at 90 degrees, and unsafe at freezing temps. Do the same safety trigger routine with a 1911, and you might get surprised, safety off, bang.
Another 1911 tip, don't release the slide on an empty magazine, or no magazine, whether it has had trigger work or not, that extra velocity of the slide with no resitance is hard on sear relationships, keep the trigger pulled to engage the disconnector, I do it on loaded guns for the extra safety factor and to protect my trigger jobs, If you have a disconnector problem, it will show up in normal shooting. #2 on any full auto or Semi, have complete control when you chamber a round, always assume when you chamber a round, the firearm will fire, and more than once, I have a friend who put 3 .45acp rounds through his left arm, because he detail stripped his gold cup and got the extra sear piece in wrong, gun in right hand, dropped the slide on a full mag, with one hand and relaxed, it went FA on him, you can just imagine, I have had a 1911 go FA on me, rpm is higher than you think. I was in competition and had full control when it happened.