A long-standing hypothesis offers that any organization which is not explicitly conservative will over time become liberal. This information would tend to confirm it. Or, the person in question might just be a lone idiot. Let’s put it this way: I do not own a single weapon (and I own a few) whose magazine capacity is limited to five rounds, nor will I ever, unless the weapon in question is an RPG.
What about a magazine fed .50 caliber Sniper rifle? This one has a magazine capacity of 5 rounds and has an MSRP of "only" $6,000.
OTOH, this one's magazine holds 10, but it's MSRP is $8,050.