About the parts : - Balystik Rail - it fits perfectly, light and awesome looking. Seems to be the best quality-price ratio - Charging handle - looks awesome and fits perfectly in the Systema upper reciever - Orga Barrel+Cylinder - excellent craftsmanship and perfect fit.Changed the spring with SHS150 and the replica fires at about 140-141 m/s constanly. Very accurate and constant. - Systema upper - fits perfectly with Celcius and Systema lowers. The paint was a cracked around the dust cover and small bits were missing. For 150 euros i admit i was a bit disappointed about this. As for POWAIR team : excellent as always. The package came in 2 days international, perfectly wrapped, no issues. I will give a 5 stars rating, but please check the parts more carefully next time.