The quad rail is actually fine, if you need to minimize weight just get the DD rail for it. As for the barrel you know it depends on what version, also keep in mind the criteria you determine. But to say the HK416 in 10.4 which weighs what again (D10RS: 3.020 kg (6.66 lb)that is hardly a heavy rifle in any circumstances. That does not seem like a heavy rifle to me for the added benefits you are getting.


















































