Check the listing for details. Pearce Grip PG-FI21G4 Glock Fits GEN 4 GEN4 20 21 40 41 Frame Plug Insert - NEW. Color: Black, Condition: New. Listed at 7.62 USD. WE OFFER SUPER FAST & FREE 50 STATE SHIPPING & HAVE EXCELLENT FEEDBACK !!! Thanks for visiting ROCK MOUNTAIN TACTICAL ! We are Authorized Full Line dealers for several high quality brands such as: Magpul, Strike Industries, Ajax Grips, Viking Tactics, ODIN Works, GG&G, Eberlestock Packs, Emerson Knives, Milspec Monkey, Savvy Sniper Slings, Impact Weapons Components (IWC), Strike Industries, Wilson Combat, Zev Technologies, Arisaka Defense & many other excellent name brands. We have 1000s of items in stock & our inventory is updated daily. Please browse our eBay Store at Rock Mountain Tactical - KATN since 2006 … On Time. On Target. NEVER QUIT !!! Listing is for (1) NEW Pearce Grip PG-FI21G4 - Glock GEN 4 Large Frame Grip Frame Insert / Plug - See info below for correct fitting. Description: - This unit installs in the bottom rear cavity of the frame utilizing the lanyard hole for retention. - Fits Glock GENERATION 4 models: M20, M21, M40 & M41 pistols only. - This product will only fit new Generation 4 frames. - From Pearce's website: The PG-FI21G4 fits all Generation 4 (GEN4) Glock frames: G20 / G21 / G40 / G41 (Glock 20, 21, 40, 41). - Allows for use with or without of the factory interchangeable backstraps. - The plug uses a friction fit for retention and does not come out without manually trying to remove it. Key Benefit: - Helps keep debris out of the magazine well and space inside grip frame as well as generally adds to the appearance.