The Cross Armory Double Stack combines two AR-15 10 round Magpul PMG’s for a lightweight solution for restricted states. This stack is similar to to a 30 round magazine, can be used as weighted butt stack, and is crafted from lightweight aircraft aluminum.
Cross Armory Double Stack for Magpul Gen 3 PMAGs
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The Double Stack from Cross Armory is a solution for restricted states like California, and others, where 10 round magazines are the maximum allowed by law. The Double Stack combines two AR-15 10 round Magpul PMAGs for an overall length similar to a 30 round magazine. It is machined from lightweight aircraft aluminum.
The Double Stack is also usable as a weighted butt plate to assist empty mags falling free during reloads. Available in black. PMAGs not included.
Manufacturer Part Number: CRDS-PM10G3
Check out this video from the Daily Shooter for a review of the Double Stack:
Questions and Answers
Answered by the admin We are not attorneys or legal experts and can not offer legal advise, but we can say the code section state a large capacity magazine as being "a box, drum, tube or other container which is capable of holding more than  10 rounds of ammunition to be fed continuously and directly therefrom into a semi-automatic firearm." The DoubleStack allows the magazines, when coupled together, to hold more that 10 or 15 rounds, but does not allow for "continuous and direct" feeding of all the rounds.