there are other advantages to the heavier mods, muzzle weight significantly reduces muzzle flip and felt recoil, the over barrel design achieve better balance than muzzle cans, so whilst they may be heavier a lot of the additional weight is further back towards the centre of balance. Granted if I was hill stalking and carrying it miles I would look for smaller lighter alternatives but for lowland and high seat stalking, if your hearing is your reason for doing it then it is widely regarded that the PES t12 is one of the best for sound reduction.