Quote Originally Posted by Barryg View Post
The HW80 TP is a mystery to me I can understand why the short sliding breech TP is so efficient but the 80 is just a straight offset tube, but you are right it is efficient
Are you sure it is as efficient as your 52?
consider..I tuned the AGT80 .22 and the 25mm 0.22 D52 to produce the same power output...the weird thing is both needed the same swept volume to attain the same shot cycle feel. Then I measured the transfer port length on the D52, coupled with the breech seal its around 8mm, not really that different to that of the HW80.