At what point (how many rounds, roughly) does gas port erosion typically become a problem in a carbine-length gas system using a mil-spec barrel?
I’m sure erosion occurs each time the trigger is pulled, but I’m curious as to when problems start to show themselves.
Thanks.
Many factor’s here. Type of ammo, length of barrel, GP size, type of gas system being used and rate of fire (FA VS SA).
Typically your shorter barrels (with a carbine gas system) are going to errode much faster. As is a gun fired on FA.
If you are shooting a Mil-Spec barrels that is properly chromed (with the correct thickness), in a 16" flavor, I think you won’t see any significant errosion till after 5000-8000 rounds. This is just my opinion so do not take it as fact.
C4
Thanks, Grant. That gives me a base to work from. I’ve got a couple of Colt 6940’s and all I shoot is M855 (Prvi or IMI).
port erosion starts immediately, obviously, and can be detectable pretty quick, depending. i’ve got a 10.5 that’s already opened up 4 thousanths of an inch in less than 5,000 rounds.
as grant said, it depends. one rifle might not erode much in 10,000 rounds, while another might open up a full hundredth, or more, in 10,000 rounds, if it was shot hot and hard for those 10,000. CQB weapons, SBR or not, will erode faster- these guns get shot hot and hard. precision/DMR type guns will probably not erode enough to effect anything for 20k, assuming the leade last long enough to get to 20k
There might be some interesting info in this:
Thanks, lots of good stuff in there.
You’re welcome. 