Pearce Grip PGMPS+ Magazine Extension made of Polymer with Texture Black Finish & 1" Gripping Surface for S&W M&P Shield, M&P Shield M2.0 (Adds 2rds 9mm Luger, 1rd 40 S&W) $7.66
Harris Bipods BRM1A2 Non-Swivel BR Swivel Stud, 6-9", Black Steel/Aluminum, Notched Legs, Rubber Feet $86.57
Pearce Grip PGG42733 Magazine Extension Grip Extended Compatible w/Glock 26/27/33, Black Polymer $6.40