This will work on any standard Mil-Spec AR-15 lower receiver.
The Strike Industries AR Enhanced Lower Receiver Parts with Trigger, Hammer&Disconnect will work with Mil-Spec lower receivers. If your Radical Arms AR lower is Mil-Spec it will work.
The Strike Industries AR Enhanced Lower Receiver Parts with Trigger will work with a Mil-Spec AR15 lower receiver. It might work with your .22LR upper receiver depending on if that upper receiver requires any specific modifications in order to work with a Mil-Spec lower such as the trigger and bolt catch. I recommend contacting the manufacturer of your upper to see what specific requirements may be needed for the upper.
This AR-E-LRPTH is made in Taiwan.
No, this is meant for mil-spec AR15 lower.
Yes this lower parts kit is Mil-Spec.
Manufacturer dose not specify the type of steel used.
No, this dose not come in AR-10 platform.
Yes, it can be set at 60 or 90 degrees throw. Be sure to use some blue loctite on the screws
Yes this product comes with ambidextrous safety.