The Systema PTW Clone, the A&K M4A1 PTW is reviewed by Red Army Airsoft Club. They find it has great accuracy outside of the box and just just like the original PTW, you can quickly change cylinders to fit the requirements of airsoft (and perhaps) training events. It is very close to original one in terms of dimensions and response time is quite decent. It's not you average priced A&K as it will cost more, and the buttpad also quickly wears out.

Read the full review here and below is the video supplement.