Check the listing for details. Aluminum Rear Cover Slide Back Plate fits Glock Gen 1-5 G17 19 21-29 30-39 40 41. Color: Black, Condition: New. Listed at 9.99 USD. OVERVIEWThese backing plates are machined from billet 7075 aluminum and hard anodized black.These billet aluminum plates are many times stronger than the original.Compatible with 17 19 21 22 23 24 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 Models Gen 1-4 ONLYFits for Glock Model: Gen 1-4 (17 17L 19 Gen 1 2 4 ) 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41Include: "S" "FS" "MOS" "MOS FS" etc. Fits for Glock Model: for Gen 5 Glock Model(s): 17, 19, 19X, 22, 23, 34 & 45. etc. Caliber(s): 9/40. for Gen 1-4 Glock Model(s): (17 17L 19 Gen 1 2 4 ) 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 Include: "S" "FS" "MOS" "MOS FS" etc These backing plates are machined from billet 7075 aluminum and hard anodized black. These billet aluminum plates are many times stronger than the original. KEY SPECSMaterial: AluminumColor: BlackCONTENTS1 x Back Plate NOTESDoes not fit Gen 3 G17 19 17LDoes not fit G42 and G43