TexasCHLforum.com

The BPS near me has the same sign, and the intention is for people who are bringing in guns for repair or for people who are taking guns to the indoor range to check their weapons. However, if you are law enforcement or if you have a CHL then they will not make you check your carry weapon. Basically, as long as it is concealed then they have no problem with it (of course law enforcement does not need to be concealed). However, if you are taking multiple guns to the range for shooting (or for repairs) then they want you to check those guns at the door (even if you are law enforcement). You do not, under any circumstances, have to check your carry gun.

This information came to me directly from the store manager here in Grapevine when I inquired about the signs.