16" 7.62x39 Mid-Length 4150 Nitrided Barrel

A: No modifications are needed in the upper. You should have no problems with the wider feedramps of the barrel extensions and standard m4 feedramps of upper receiver.

A: Barrel Extensions with a large wide single feed ramp with no middle lug does not support the bolt assembly properly and puts undue stress on the lugs on each side the extractor and is attributes to premature lug failures next to the extractor; therefore, we designed our 7.62x39 feed ramps that are specifically designed for 30 caliber size bullets

A: Sorry we are unable to cut the barrel down to 14.5".

A: Unfortunately our barrel manufacturer we had for several years passed away after a short fight with pancreatic cancer. All our barrels now are done by Shaw Barrels using our drawings/specs.

A: It's .725"

A: We use parallels under the flat of the gas block and upper receiver that gets your gas block top dead center (not canted to left or right) then you want a space of .035" (use a feeler gauge) between the gas block and the barrel's shoulder. You can also buy a dimpling tool but it's not needed.

A: We prefer mid-length in our 7.62x39 as it's cycling the action of the rifle with lower gas port pressure and you have greater dwell time before the rifles action starts unlocking.

A: Yes you should have no problem according to their engineering person that state you can use AR-15 7.62x39 barrels with the KS47 rifles.

A: No, dimpling would break the corrosion layer of the barrel, yes the gas port is drilled after nitride but it being covered by the gas block and high pressure of air it doesn't have high risk of corrosion like dimpling as most gas blocks do not cover them causing it to corrode. Gas blocks that utilize set screws use flush cup screws that bite in the steel and when using a thread locking compound like Red Loctite it is not necessary to have a dimpled barrel.

A: It's Blacknitride QPQ