I'm going to cheerfully answer a question you didn't necessarily ask (😁) and share that an M16 is a good alternative for both of these.
As a FA 10/22 stand in, my CMMG/BoreBuddy .22 conversion is super reliable and probably my favorite configuration for my M16.
As an American 180 stand in, my Tactical Innovations AM-15 upper has been great and will do a mean drum dump. Swapping out the regular M16 FCG for the open bolt FCG that the AM-15 needs is a little tedious, but only a little.
The M16 is where it's at for FA .22, IMO.
Totally agree. My first MG was a RR AMT Lightning (stainless clone of the 10/22) that Norrell converted to his system. I got this during the 1994-2004 ban so your only choice was pre-ban plastic mags. Norrell's recommended mag was the steel lip Butler Creek mags and a close second was the Eagle Arms 30 rounders. I ended up wearing out the feed lips on my Eagle mags and the bolt on my Norrell cracked in half. Norrell made me a new bolt which is milled out to accept his custom anti-bounce weight. I asked he would sell me a spare bolt and he told me no.
He said he would only replace it once the current one breaks. Other issue is the proprietary fire control parts that Norrell made.
At the time, M16's were going for close to my Norrell so I sold it to buy an M16 which was the best thing I could ever do even if just talking 22LR as back then I could still get steel Ciener kit mags that never wear out. No problem getting spare kits and firecontrol for the M16.
I also have a belt fed LM7 and Razorback w/ a 500 round belt. I never bought any of the 1000 round belts.
No longer made but as posted above, I think the Craig may release the AM-15 agin.
I have several friends that have AM180's and once tweaked they have all run very well. But I'd still take an M16 over a 10/22 or an AM180.