I just purchased a lancaster AK-47 underfolder. I'll give you the low down on it.
1. Built on a DCI stamped / heat treated 1.5mm receiver.
2. Mine has plastic furniture - which I prefer over wood.
3. Built using polish parts. All matching numbers.
4. The entire gun has dura-coat, or some kind of black tough finish on it. Doesn't scratch easily
5. It is supposed to have a chrome lined barrel. I have been unable to verify that the barrel is chrome lined. this could be due to the fact that part of the bore got black dura coat on it, and I can't see the chrome lining, or it may not be chrome lined. This is dissapointing to me, since I specifically wanted a chrome lined barrel. However, the barrel was part of the polish parts since it is numbered accordingly.
6. The folding mechanism locks up solid, but is a little stiff.
7. Internal parts look to be decent quality - bolt carrier is good quality. Bolt is the type with a floating firing pin, not sprung firing pin like the chinese rifles.
8. I also have a fixed stock Polytech stamped receiver gun that I have compared it to. The polytech receiver is blued and finished a little nicer. The polytech fire control parts, bolt and bolt carrier are slightly better quality. The polytech barrel appears to be slightly thicker, and IS CHROME LINED. The action on the polytech is a little smoother.
9. I have fired the Lancaster AK and it works just fine.
Overall, the Lancaster is a good build. I have seen a Global 1.6mm reciever gun that I like a little better, but passed on it because it had an american made aftermarket barrel on it. I am concerned that I didn't get the chrome lined barrel - I have some old corrosive chinese ammo that I wouldn't mind shooting in it - but won't until I can verify whether the barrel is chrome lined or not. I'm betting it's not. But, the barrel has very sharp grooves in it - looks new.
I paid $800 for it within the last 2 months. I feel like I paid a little too much for it, but oh, well I always wanted an underfolder that I could use as a shooter, now that the Polytech is more of a safe queen.