While our gun is not a pure PWS MK107, it uses a PWS MK107 upper. The upper features a short 7.5″ barrel with a 1:8 twist and a Wylde chamber. The barrel is nitrided inside and out for corrosion resistance and long life. The Wylde chamber allows for the use of both .223 and 5.56×45 ammo with no issues and is slightly more accurate due to a tighter throat than the typical 5.56 chamber. The 1:8 twist is great for heavier bullets and not to shabby with light bullets. The gas system is very simple with one moving part; the piston and operating rod are unitized into the bolt carrier. The barrel and gas piston system are covered by a nice full floating, lightweight and low profile keymod handguard. The handguard comes with two removable rail sections. The MK107 upper uses a forged mil spec upper receiver.
