The only time my gun store was burglarized they pryed the rear door open at the bottom enough for some skinny crackhead to worm his way in...He then took the crossbar off and opened the door for everyone else...Then the alarm was activated and in less than four minutes they were gone with 52 guns worth $40,000.00 wholesale...
They had evidently been there and checked it out because they knew the door sensor was at the top and they knew where the most expensive guns were...The deputies responded within four minutes but it was too late...Afterwards we installed double security doors at the rear exit with extra sensors...Bottom line: wherever your weakest point is, they'll find it...
To this day, none of the guns have turned up nationwide and the case remains unsolved...

...Ben