Rise Armament RA-140 and the 15-22?

[SabreJim]

Anyone out there have experience with the RA-140 drop-in trigger? RISE Armament RA-140 Super Sporting Trigger- SST
The manufacturer doesn't recommend it with the polymer lower of the 15-22 but I'm not sure why it would be any different than the others.

Any help is appreciated.

 

[cjt50]

Maybe the spring weight they use for the hammer is too light to reliably touch off rimfire. (that's my guess )

 

[SabreJim]

Thanks. I may buy to try and if it doesn't work, pull it and drop it in to my Stag (real) AR. Just don't understand the reference by Rise to the polymer lower.