Steel lined body w/ polymer lining to make the dimensions same as Stanag/ar, pinned or riveted at 10rds. The end user isn't too dumb to remove the polymer if it gets damaged or cracked. There's always a way, always a loophole, just look at all the loopholes that got us Canadians here in the first place thanks to the liberals, ndp, c21, attempted confisactions, OICs, and the wacko with a AR in Nova Scotia that ruined it for everyone including major businesses and shutdowns/layoffs.
Overall once it leaves my hand its pinned/riveted to 10rds and it only fits stanag/ar size magwells which follows all laws in accordance currently in place unless C21 changes more, so any modification or alteration by anyone afterwards im not resposible for, its no different if someone bought a factory mag and modified that or drilled the rivet or pin out to do something else it was not intended for.