$1.99MP5 Mag Coupler
myminifactory
This accessory keeps a spare magazine handy when the primary one runs out. Made to fit many MP5-style magazines, my current ones measure 23 x 35MM in size. To assemble it, you'll need a nut and bolt of suitable dimensions - specifically, the screw diameter should be less than 5mm, while the bolt must be smaller than 10mm in size.
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