The more the gas port opens up, the quicker it progresses. Since a Bushmaster's gas port is not to spec and already 'more open' than it should be, this will progress significantly faster resulting in more wear n' tear and inevitable problems.
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The more the gas port opens up, the quicker it progresses. Since a Bushmaster's gas port is not to spec and already 'more open' than it should be, this will progress significantly faster resulting in more wear n' tear and inevitable problems.
How important of a role does the proper material play?
I.e. 4150CMV and hard chrome lining.
Obviously rate of fire can't be accurately quantified.
Wow I had no idea, pretty interesting. Thanks for posting this.
I've sectioned barrels with 25 and 30K rounds through them that didn't look quite that bad. And I've sectioned barels with fewer than 50, one with exaclty 30, and one with 5 rounds through it.
The bad news-- it starts right away. The good news, maybe: the erosion occurs along the axis of the bore and does not creep up the gasport very much, proportionally speaking. In my opinion, gas port erosion does not equal gas port enlargement.
that barrels been very hot, it is hard to even find the rifling.
On a particular contract I worked on we borescoped the barrels due to issues we had with the BM barrels. The armory supervisor stated that if the port was "egged" out we would replace them because they knew from experience that the issues weren't far behind- specifically bolt bounce.