BudsGunShop.com - Internal lock?

seems like we found it listed both ways so I suggest contacting S&W to be 100% sure By Telephone:
(USA) 1-800-331-0852
Mon-Fri 8:00AM-6:00PM Eastern Time

This model does not have the "Internal Lock" Daniel. --- The Smith & Wesson 150785 442 Centennial Airweight Revolver in .38 Special features a 1.875-inch barrel, black finish, engraved aluminum alloy receiver, wood engraved grip, front serrated ramp sight, rear notched sight, internal hammer, smooth target trigger, aluminum alloy and carbon steel construction, double action only trigger, an overall length of 6.3125 inches, an unloaded weight of 15 oz, and a 5 round capacity. S&W details here : smith-wesson.com/firearms/model-442-revolver-engraved

yes it has the internal lock see *****UPC:
022188142235
Description:
S&W M442 CEN ENG 38SP DAO 1.87
Brand:
Smith & Wesson
Model:
Model 442 - Centennial Airweight, Machined Eng
Type:
Revolver: Double Action Only
Caliber:
38SP
Finish:
Matte Black
Action:
Double Action Only
Stock:
Engraved Wood Grips
Sight:
FT: Integral RR: Fixed
Barrel Length:
1.875
Overall Length:
6.3125
Weight:
15 oz
Capacity:
5
********Safety:
Internal Lock
Receiver:
Aluminum Alloy