Extended Barrel and Control Lever for AsgardianArmoury's Lara Croft's HK 9mm Pistol (https://www.thingiverse.com/thing:3171141).
The Extended Barrel's insert peg will likely need to be sanded to fit your pistol print.
Control Lever taken from Fallout 17's USP-S with Removable Supressor (https://www.thingiverse.com/thing:3293529).