BudsGunShop.com - Does this model have the internal lock?

Hi Shane, Yes this comes with the "Internal lock" --Specifications & Features:
Smith & Wesson Model 638 Airweight Revolver 163070 --
Double Action/Single Action --
Shrouded Hammer --
.38 Special +P --
5 Rounds --
1.875" barrel --
Small J-Frame --
Aluminum Alloy --
Serrated Ramp Front Sight--
Fixed Notch Rear Sight--
Black Synthetic Grips--
Matte Silver Finish--
--
Overall Length 6.3" --
Weight 14.6 Ounces

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Yes it does Shane. - FAMILY:638 Series - MODEL:638 - TYPE:Revolver - ACTION:Double / Single Action - FINISH:Matte Silver - STOCK/FRAME:Alloy Frame - STOCK/GRIPS:Black Synthetic - WEIGHT:15 Oz. -
CALIBER/GAUGE:38 Special - CAPACITY:5 - BARREL:1 7/8" - OVERALL LENGTH:6.31" -
SIGHTS:Fixed - SAFETY:Internal Lock - ADDL INFO:Small Bodyguard Frame - ADDL INFO:Airweight.