Hi-Point Firearms (Model 995) carbines are robust, accurate, reliable and affordable price. Sales of this popular carbine are in the hundreds of thousands.
The Hi-Point OEM carbine magazines hold 10-rounds. For engineering reasons and the huge volume of sales there were no plans by Hi-Point to make a higher capacity magazine. Earlier 2016 Hi-Point finally came out with a 20-round 9mm single stack magazine called the Redball.
Hi-Point Redball 9mm magazine
It fits and feeds the 9mm Hi-Point carbine without fail and for that reason is the only high capacity magazine tested and approved by Hi-Point Firearms.
While it looks like two magazines welded together--it's not! The mid-point Polymer molded grip fit magazine well stabilizer called a Locking plate locks the magazine firmly in the carbine's grip thus preventing wiggle and assuring reliable ammunition feed.
For the early part of 2017 Hi-Point plans for a new high-capacity magazine in .45 ACP.
Also on the drawing board are .40S&W and .380ACP magazines. It takes time to develop and create a reliable feeding magazine, much more complicated than most folks think and the company is so busy making carbines and pistols it is hard to design and push into manufacture a magazine, but they are trying.