friend of mine just got a Ruger PC carbine. its the one with the rifle stock and Mlock handguard. you can also get the tactical/chasis model with the AR buttstock
I got to work on it a bit. changed the charging handle to the left side, and installed the Glock mag adapter. both were very easy to do. and seems like any modification will be very easy to do. the design on this PCC is very modular, and is just begging to be modded. of course its not as modular as an AR, but for something that is not an AR it is very easy to work on and disassemble and reassemble. Volquartzen makes a drop in trigger 2.5lbs, but a little pricey, but what isn't pricey from Volquartzen
we shot it at kokohead over the weekend and it had no malfunctions, worked great with the Glock mag adapter. can also change the mag release to R or L side, but its already on L side so I left it there. the peep sights are ok, I'm just not a peeping Tom, so I'm not that fond of those sights. but my friend will be putting a red dot on it, or maybe put a Holosun 510c on it. there's also aftermarket FO sights can replace the stock ones with
but its a great pistol caliber carbine, that's not an AR.
if I wasn't saving for another gun that i really want, i would pick one of these up. fun gun to shoot, very little recoil
some updated videos: