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Old 01-01-2019, 05:16 PM   #1
Join Date: Nov 2018
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New to Wheel Guns - Need expertise

While cleaning my new GP100 after putting about 200 38 Special through it I noticed there is a ring (Band almost) in each cylinder about 1/4" from the muzzle end. The chamber also seems a bit tighter in that area all the way to the end. Cleaned and scrubbed really well with CLP and it's still there. It's symmetrical enough that it could be designed in but I wanted to b sure before I called Ruger and they said to send it in for inspection. Hopefully someone here knows the answer.
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Old 01-11-2019, 09:28 AM   #2
Join Date: Jan 2009
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Although it’s typical to het a fouling ring in a .357 cylinder when you shoot .38 Special ammo in it, it will come out with a solvent like Hoppe’s or CLP and a brush. I think what you’re seeing is the end of the actual chamber in each cylinder that centers the bullet. It’s designed that way, so no worries.
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Old 02-22-2019, 06:32 PM   #3
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IF your GP100 is stainless steel AND the ring is indeed lead or powder residue the answer may be a tornado brush. It’s a stainless steel brush so don’t use it in a blue steel gun.

NRA Endowment, TSRA Life, Texas Gun Collector’s Assn, Winchester Arms Collectors’ Assn, Whittington Center, North Texas Shooters’ Assn.

Last edited by TXGunNut; 02-22-2019 at 09:00 PM.
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Old 12-05-2019, 12:41 AM   #4
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What type of .38 Spl round are you shooting?
The budget 130gr FMJ that's commonly found shouldn't lead your barrel

See if a .357 round will pass the plunk test.
If not, you've got a lead build up than can be removed with solvent and a brush.
If it does pass the plunk test, what you're seeing is most likely the end of the chambers
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