MagPul PTS MASADA ACR in Rifles (AEG) Posted June 16, 2011 · Report reply Very nice Nikon! I'm also using a cylinder head by Modify, but mine is GB-04-02 Aluminum Cylinder Head for Classic Army AUG/G36C ... I think. Seems to work well also. Btw, I have used mainly Modify parts for couple of years and they have very good quality. Only problem is there's no good retailer in Europe. http://www.airsoftworld.net/ They have a bunch of Modify parts.