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Normal carbon buildup like @Mr.Stu said. You can leave it alone. It does not impact the function of the gun. The bolt will fail/need to be replaced before it builds up enough carbon to effect function. If it bothers you, the CAT Tool linked above works well, but it also adds unnecessary wear to the bolt tail. Make sure the gas rings and extractor are in spec. Then wipe down the firing pin, clean the lugs and bolt face, wipe down and lube the rest of the bolt. That is about all that is needed.

My carry rotation. G43x with parker mountain comp brings the overall length to assentially a 48, lol As for the original question; Pros: Light weight, maximum NJ capacity (10). The slim models are very easy to conceal without having to worry about printing. If your end goal is to carry, it is very comfortable as far as form and weight. The longer grip just feels better in handling and controlling the gun. The ones where I have to hang my pinky over the grip I tend to have to readjust my grip during fire. Cons: Slight kick due to the overall size of the gun, but it really isn't bad (especially with a comp =P). This next part is a con for me personally, but the grip, even with the grip texture was still more slippery than I'd prefer but grip tape helps with that!

That's just carbon build up. Not a big deal. It is one of the consequences of a DI system. A tool like this makes cleaning it much easier. https://www.amazon.com/CAT-Outdoors-Scraping-Scraper-Cleaning/dp/B09QY26MKS

IMO this guy had enough of everything. California Authorities Raid Gun Owner's Home, Seize Massive Stockpile of Firearms and Ammunition – RedState California Attorney General Rob Bonta today announced the arrest of a suspect in Richmond with a large cache of illegal firearms, including assault weapons, high-capacity magazines, and approximately one million rounds of ammunition. The suspect is alleged to be legally barred from owning weapons.

She ain't wrong. He's doing stomach crunches.

Hawaii can say aloha to my tourist dollars.

That’s a nice rig @EngineerJet!! I have a 43x slide I got milled for a dot. I’m planning on comping it (waiting for the Radian setup for the 43x to get released. I like the PMM but I don’t like the installation) and using it on a G48 MOS frame. I swap between my G19 and G48 for daily carry now. I definitely shoot my G19 better (more accurately and faster) than my G48 at 20-25 yards. It’s a wash inside 20. @Mrs. Peel saw it first hand Thursday night. Couldn’t keep the 48 in the black of a B8 past 15. With the 19 I had no issues.

Bidenomics in action!