Are you working to build an extremely accurate and powerful rifle that you can reliably use in the field? Do you want to start with a system that will give you all of the parts you need in one convenient package? If this is your objective, then the PWS MK214 Piston 308 Win / 7.62 NATO 14.5″ Complete Upper Pinned FSC (17.5″) is a great option.
Featuring a 14.5” barrel and a pinned FSC30 muzzle device, this upper was built around a system that would work. The FSC30 helps to improve weapon accuracy while lowering the felt recoil to more manageable levels, giving the rifle you build around this upper lethal accuracy out to 700 meters. This extreme accuracy all comes in a relatively small package, making it a great choice for those looking to build a covert tactical rifle. Additionally, the system features a long-stroke piston system and enhanced carrier group, both of which work together to create smooth and reliable weapon cycling. The free floating rail design further improves performance, giving you a great system to add accessories without any issue.
If you want an upper with an extremely accurate system in place, then you may consider starting with this MK214.