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Hi Kevin, No it doesn't have the internal lock Here are the Specifications and features:
S&W Model 351C rimfire revolver
.22 Magnum caliber
1-7/8" barrel
7 round capacity
Double-action only
Synthetic grips
Aluminum alloy frame and cylinder
Matte black finish
White dot front and fixed U-notch rear sights
6-1/4" overall length
11 oz.

does NOT have the internal lock UPC: 022188033519 Description: S&W M351C 22M DAO 1.87B 7R NIL Brand: Smith & Wesson Model: Model 351C Airlite Centennial Type: Revolver: Double Action Only Caliber: 22M Finish: Matte Black Action: Double Action Only Stock: Matte Black, Synthetic Grip Sight: Front: White Dot Rear: Fixed U-Notch Barrel Length: 1.875 Overall Length: 6.25 Weight: 11 oz Capacity: 7 Features: J Frame; ******No Internal Lock

It cut this off...the main part ADDL INFO:NO INTERNAL LOCK

This pistol does not have the factory ILS : Smith & Wesson, 351C, Double Action Only, Small Frame, 22 WMR, 1.875" Barrel, Alloy Frame, Black Finish, Rubber Grips, Fixed Sights, 7Rd, with out Internal Lock Fired Casing Product Specifications UPC Code: 022188033519 Manufacturer: Smith & Wesson Model: 351C Action: Revolver Type: Double Action Only Size: Small Caliber: 22WMR Barrel Length: 1.875" Frame/Material: Alloy Finish/Color: Black Grips/Stock: Rubber Capacity: 7Rd Description: W/O Internal Lock Fired Casing: Fired Case Sights: Fixed Sights Manufacturer Part #: 103351

does NOT have the internal lock UPC: 
022188033519
Description: 
S&W M351C 22M DAO 1.87B 7R NIL
Brand: 
Smith & Wesson
Model: 
Model 351C Airlite Centennial
Type: 
Revolver: Double Action Only
Caliber: 
22M
Finish: 
Matte Black
Action: 
Double Action Only
Stock: 
Matte Black, Synthetic Grip
Sight: 
Front: White Dot Rear: Fixed U-Notch
Barrel Length: 
1.875
 Overall Length: 
6.25
Weight: 
11 oz
Capacity: 
7
Features: 
J Frame;
******No Internal Lock