The best replacement for a2 stock is a1.

The best alternatives to a2 stock are rated as following:
★★★★★  a1
★★★  a1 stock
★★★  magpul prs

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Speaking about a2 stock, one probably shouldn't forget about carbine.

Other search terms related to a2 stock and their ratings are:
★★★★★ carbine
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a2 stock
a1
a1 stock