Soon, every store on the block will be the setting for a reality show. After all, if “Parking Wars” can celebrate the DMV, can a show set in a laundromat be far behind?

“Lock ‘n Load” (7 p.m., Showtime) offers a hidden-camera take on working in a Los Angeles gun shop. Creator and producer Josh T. Ryan “performs” as a salesman to a diverse clientele in search of concealable handguns, shotguns and semi-automatic weapons.

Both Ryan and his show take a hands-off approach to a subject that is “loaded” in every way. His customers include a few dolts who make crude jokes about their wives; a mother, father and infant who pose with some impressive firepower; a petite woman, looking for a small gun, who happens to own a construction company in a “crappy” (her word) part of town; two guys who claim to work security in a neighborhood besieged by gang warfare; and a woman who shoots clay traps for sport. The store also includes a firing range in the basement, so many of the conversations and sales occur over a percussive din.

Ryan’s most surprising customer is a local preacher who likes to bang away at the firing range after a hard day of ministering to his flock. Between squeezing off rounds, he claims there is something biblically justified about using a handgun to defend one’s family. There’s no turning the other cheek for him.

By concentrating on sales and customer service, and allowing the customers to speak for themselves, “Lock” does a good job of revealing the culture of gun ownership without overt judgment or observation.

• Soledad O’Brien and Rose Arce host the four-hour, two-night special “Latino in America” (8 p.m., CNN, tonight and Thursday).

• “Living with Ed” (8 p.m., Planet Green) returns for a third season on a new network. “Living” follows actor and environmental activist Ed Begley Jr. through his day as he tries to lower his carbon footprint without driving his long-suffering wife, Rachelle Carson Begley, crazy.

• “True Hollywood Story” (9 p.m., E!) profiles Courteney Cox, the former “Friends” star whose new series, “Cougar Town,” received mixed reviews but has recently been picked up for a full first season on ABC.

• Former “SNL Weekend Update” host Dennis Miller, often seen trying to bring humor to the irony-free proceedings on “The O’Reilly Factor,” gets to appear as guest programmer on TCM. He joins host Robert Osborne to present and discuss films, including “Dodsworth” (7 p.m.), “The Third Man” (9 p.m.), “Suspicion” (11 p.m.) and “Mr. Blandings Builds His Dream House” (1 a.m.).

Tonight’s other highlights

• Will composes a special song on “Glee” (8 p.m., Fox).

• School-bell blues on “Modern Family” (8 p.m., ABC).

• “Monty Python: Almost the Truth” (8 p.m., IFC, part 4 of 6) recalls the troupe’s American reception and the move from the small to the big screen.

• Hip-hop competition can be murder on “CSI: NY” (9 p.m., CBS).

• Four talents bring a system to their efforts on “Art in the Twenty-First Century” (9 p.m., PBS, check local listings).

Cult choice

The Halloween horror silly season is upon us, so expect plenty of helpings of movies like the 2000 spoof “Mom’s Got a Date with a Vampire” (7 p.m., Disney), starring Caroline Rhea and Charles Shaughnessy.