This is meant for the Mil-Spec lower receiver.
This will fit the lower of an AR9, but many recommend using a pistol caliber carbine dedicated trigger specifically because of the nature of a blow back system and the force is puts upon the hammer when it is reciprocating. PCC triggers usually have slightly beefier hammers/springs to accommodate for the extra force.
You are correct. This will indeed work great with the CMMG 22LR Conversion kit.
Yes, it should fit as DPMS states the G2 Recon uses standard MSR fire control and takedown components (AR-15 triggers).
The OpticsPlanet Exclusive RISE Armament RA-535 Advanced-Performance Trigger will function as intended with your factory weight buffer.
Yes, this will work with the Springfield AR15 lower.
Yes, this trigger is compatible with the SFAR 308.
Yes, this will fit in a Sig Spear LT
Yes, this will work with an AR 47 7.62x39
Yes, this will fit an AR15 chambered in 300BLK