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Clean the barrel thoroughly before replacing it. Use solvents for removing both copper and powder fouling. I have made a few bad shooting rifles shoot a lot better after a thorough cleaning.
Train 2 Win
Yep, cleaned old barrel thoroughly with lots of greenish residue coming out on the patches but still had accuracy issues. Can't take the flash hider off to clean the crown as it's pinned to meet the 16" OAL.
A new barrel from LMT solved all the problems and now it shoots like a laser beam again, even groups well with the 55grn M193.
Can I have your old barrel![]()
IMO likely-hood of issues, at that rd count, with a quality barrel.
1) fouling/obstruction at muzzle device
2) carbon build up IVO throat
3) throat erosion
4) excessive copper build up
Personally, I rarely clean barrels, time better spent on trigger. When I do, prompted by groups opening at 300m is the indicator. 50-100M groups may not show the spin "taking". My priority is carbon, then copper. Then a mag to re-foul.
If one has limited range facilities and pays for ammo your priorities may differ.
I have a krieger barreled, middy, 16.5" recce upper, a few thousand rds through it, never more than a bore snake. 10rds mk262mod1 all touching at 101m last zero verification.
It could be that the barrel is worn to the point that it will not stabilize bullets with shorter bearing surfaces. 6000 to 6500 rounds is about the point at which I replace a barrel on a match rifle, but my carbine barrels usually last 10,000 to 12,000 rounds.
I had a 1:9 twist LMT 16" light weight barrel make it to 10,000 rounds before I replaced it, but I did not perform a lot of mag dumps with the carbine.
Train 2 Win
"You people have too much time on your hands." - scottryan
7500-10000 rds is a reasonable expectation for a mil-grade chrome lined shorty on a rigorous institutional firing schedule.
10-12k with less heat build up and wear.
Use bimetal ammo, frange, and other specialty o questionable ammo... and who knows.
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