truckemup97
Member
CDNN had a pretty good deal on an ATI .22LR upper, so I bought myself one for Christmas. I put it on my New Frontier lower and it doesn't fire. Not even a mark on the casing, so I'm guessing that the hammer isn't hitting the firing pin actuator. (my terminology may not be completely correct) When I put the ATI upper on my S&W lower, it fires just fine. The NF lower works with my PSA .223 upper. So each piece functions as it should, but the NF lower and the ATI upper don't work together. What's going on? How can I fix this? I would rather leave the S&W together and use the ATI upper on the NF lower. Any ideas?