Tired of boring, mass-produced sandwiches and burgers? Do you long for a lovingly prepared, triple-decker masterpiece? Listed below is a sampling of restaurants offering just that. Sandwich price ranges and specialties are noted.

AE (American Express), DC (Diners Club), CB (Carte Blanche), MC (MasterCard), V (Visa), C (Choice). "Free parking" indicates the establishment has a parking lot; otherwise, expect street parking or commercial lots. "Full bar" indicates a license to sell liquor, beer and wine. "Children" indicates a children's menu with reduced price entrees.

R.J. Bentley's Filling Station, 7323 Baltimore Blvd. (near University of Maryland), College Park. Tel: 277-8898. Hours: Sun.-Thurs. 11:30 a.m. to 11:30 p.m.; Fri.-Sat. 11:30 a.m. to 1 a.m. Cards: AE, DC, CB, MC, V. Free parking. Full bar. Price range: $2.95 to $5. Specialties: the Monte Carlo (ham, turkey and swiss cheese on french toast), the Duesenberg (a triple-decker club sandwich with bacon, turkey, lettuce and tomatoes and mayo), and six-ounce burgers with choice of 15 toppings.

Bernie's Lounge, 5400 Pooks Hill Rd. (in the Linden Hill Hotel and Racquet Club), Bethesda. Tel.: 530-0300. Hours: Mon.-Sun. 3:30 p.m. to 11 p.m. Cards: AE, DC, CB, MC, V, C. Free parking. Full bar. Price range: $3.75 to $4.50. Specialties: deli sandwiches, such as hot pastrami, reuben, corned and roast beef, baked ham, tuna, turkey, and egg salad, and a variety of hamburgers.

Carmack's Restaurant, 8401 Connecticut Ave., Chevy Chase. Tel.: 652-6400. Hours: Mon.-Fri. 11:30 a.m. to 10:30 p.m.; Sat. 5 p.m. to 11:30 p.m. Closed Sun. (except for special parties or holidays). Cards: MC, V. Free parking (two hours validated for lunch, unlimited for dinner). Full bar. Price range: $3.95 to $4.25. Specialties: The Colonial (ham, swiss, lettuce and tomato on rye, pumpernickel or white bread), roast prime rib of beef, served au jus on french bread, reuben, and the Bread Board special (open-faced sliced turkey and corned beef with coleslaw and Russian dressing).

Hamburger Hamlet, 10400 Old Georgetown Rd., Bethesda. Tel.: 897-5350. Hours: Mon.-Thurs. 11:30 a.m. to 10 p.m.; Fri.-Sat. 11 a.m. to midnight, Sun. noon to 9:30 p.m. Cards: AE, DC, CB, MC, V. Free parking. Full bar. Will accommodate children. Price range: $4.25 to $7.95. Specialties: No. 11 or The Greatest Hamburger, burger with spinach, monterey jack cheese and fried onion rings and the saloon steak sandwich (five-ounce N.Y. strip steak with cheese on a garlic roll).

Henkel's Restaurant, 8955 Henkel's La., Annapolis Junction, (Howard County), Tel.: 725-4239. Hours: Mon.-Fri. 9 a.m. to midnight; Sat. 10 a.m. to midnight. Closed Sun. No cards; cash and travelers checks only. Free parking. Full bar. Price range: $4.25 to $5. Specialties: turkey, ham, corned and roast beef sandwiches served with lettuce, tomatoes, onions and mayo.

Roy's Place, 2 E. Diamond Ave., Gaithersburg. Tel.: 948-5548. Hours: Mon.-Thurs. 11 a.m. to 11 p.m.; Fri.-Sat. 11 a.m. to midnight; Sun. noon to 11 p.m. Cards: AE, MC, V. Free parking. Full bar. Children. Price range: $3.25 to $9.95. Specialties: 190 varieties of sandwiches, including the Schmender Bender (a foot-high sandwich with roast beef, corned beef, honey brisket, turkey, pork, chicken liver with a golden sauce consisting of sherry, honey and assorted spices), the Fred Ward (ham, chicken, lobster and crab salad) and the Curl World (swiss, bacon, turkey, lettuce, tomato and mayo) and half-pound big-mouth burgers.

Royal Mile Pub, 2407 Price Ave., Wheaton. Tel.: 946-4511. Hours: Mon.-Sat. 10:30 a.m. to 1:30 a.m.; Sun. 11 a.m. to 1:30 a.m. Cards: MC, V. Free parking. Beer and wine. Price range: $1.90 to $3.80. Specialties: club sandwich, steak and cheese sandwich on a knot roll and homemade soups and stews.

Sam and John's Sub Shoppe, 532 N. Frederick Ave., Gaithersburg. Tel.: 840-0677. Hours: Mon.-Sat. 11 a.m. to 9 p.m.; Sun. noon to 7 p.m. No cards; cash and travelers checks only. Free parking. Beer and wine only. Price range: $2.20 to $3.25. Specialties: steak and cheese and steak and onion subs.