SWO Daddy
Yes, it will do damage because the sections do not join perfectly together, leaving sharp edges to drag on the rifling.
With the number of high quality, one piece, coated steel or carbon fiber rods out there, there's no reason to waste money on a GI cleaning rod. If you want a field expedient kit, get an Otis kit.
The Army is not really interested in getting the longest possible life out of a barrel. First, their accuracy standards are pretty loose. Second, theu can afford to rebarrel rifles whenever they want.
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I would disagree with this statement a little. I have had my Barrel with over 12K rd count over a 12 year period and I use a GI rod. The accuracy is still very good. Accuracy comes from the crown (the last influence the barrel has over the bullet before it leaves the barrel) not from the Lands and goves in the center of the barrel.
As for Uncle sam, it's kinda hard to pack a full length Dewey cleaning rod in your ruck sack....
And accuracy that the Army is looking for and what the boys at Camp perry on their manicured lawns are loking for are really two different animals. And to compare the two is unfair and unrealistic.
And a cable like a Otis will not clean your chamber (very Important) and will certainly not get out a stuck casing.
To be honest, the barrel is the least important part on an Chrome lined AR. You can shoot 1500 rds in a 3 day period and never see a drop in accuracy. and a brush with some solvent and a few patches and your good for another few thousands rds. Most AR shooters clean their barrel way to much and their bolt and chamber way to little......
Barrels are replaced due to high round count more then damage from GI cleaning rods. Most guys don't shoot as much as a Military issue rifles see's in a few years.
If your a High-power shooter or bench-rest shooter and your shooting $300 Lija barrels in competition, then use the dewey. You want every little bit of accuracy your can get.
But for the Majority of AR owners, a GI rod will work just fine. Most of us don't shoot that well that any slight degradation in barrel accuracy caused by a GI rod is going to even be noticed. Especially when most of you all out their shoot XM193 and Wolf and Q1313 or ADCOM or SA 193 etc.....
Uncle Sugar has been killing plenty of bad guys over the past 200 years with Krags and Springfield's and Garands and Colts using GI cleaning kits.....