Mi chassis for pc carbine - Midwest Industries Rifle Chassis Compatible with Ruger PC Carbine

This one nailed it. I loved the fit and ease of assembly. It retains the ability to switch out the magazines inserts from Ruger to Glock. You also keep the original magazine release. A little drawback, is the mag button is flush now, a little extension would help. I also purchased for PC9 the MI Mlok hand guard, folding stock adapter, buffer tube and Magpul stock to complete.