https://doublemdefense.com/product/magpul-mag661-blk-pmag-21-gl9-9mm-glk/
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UPC: 840815109709
SKU: MAG661
Item Description:
The PMAG 21 GL9 is a 21-round Glock 9mm handgun magazine featuring a new proprietary all-polymer construction for flawless reliability and durability over thousands of rounds. Meeting the overall length requirements for a 140mm competition magazine, the PMAG 21 GL9 offers additional capacity without the need for expensive extensions.
Item Specifications:
Compatible with all full-size, compact, and sub-compact 9mm double-stack Glock handguns
Durable, lightweight, and extremely stiff polymer construction
High visibility controlled-tilt follower
Long life stainless steel spring for corrosion resistance
Flared, easily removable floorplate
Dot matrix panel for magazine marking and identification
Magazine indicator windows on both sides of body at 10, 15, and 21 rounds remaining
Drops free loaded or unloaded