I've got a couple of the Dagger uppers, great stuff, plug and play, unlike some others I had to "polish" to get to fit the barrel, and were more expensive.
I can assemble a Poly80 lower, buy a barrel and spring, and be under the price for entire Dagger pistol. I've even got a flat trigger on one of them, 4lbs, perfect to wall with no scratch or drag, just out of a non OEM kit.
Have a great, gun carryin', Kenpo day
Clyde