30 rd pmag is $15, 18 round extension is another $30 for a total of $45. You have to be careful of tightening the screws on the extender, there are many reports of it cracking (it's not as durable as an all magpul Pmag), and it extends out several inches the length of the mag.
I'll take the 40 round pmag over that anyday, and can have 2 of them for that price.
That's the niche it fills.
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686/M&P9 Pro/M&P15X/M&P15-22
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