GDMcDream17

I’ve had similar results with an 80% Arms AR308 lower and 20” PA-10 Gen 2 upper. All that was required was shaving ~1/16-1/8” off the top of the rear of the lower where the buffer tube inserts. Solid product for the money.

For what it’s worth, the PA-10 Gen 2 upper IS COMPATIBLE with 80% Arms AR308 upper if you shave/grind 1/16-1/8” off the top of the back end of the lower where the buffer tube screws in place (literally a 15 second fix that requires no skill or metalworking experience). I did this on one of my builds after going on a limb and buying the 20” PA-10 Gen 2 upper to save some cash. I have no complaints so far with accuracy of reliability.