First, let me start by saying that it is NOT my intention to start a heated argument. This subject has probably been discussed many times before. But I was simply curious about shooting some .45Super in my new KKM barrel, in my G21SF. First, I'd like to commend KKM for getting me my new barrel super-fast (LWD has had their barrels on back-order for many weeks, and I just flat got tired of waiting). KKM's customer service is exemplary, IMHO. In addition, it is largely the consensus amongst Glocksters that the KKM is a damn fine barrel, and the degree of satisfaction with these aftermarket bbls. runs consistently high. I wanted to know if it is safe to shoot .45Super in the KKM bbl. I have read a lot of threads by shooters and reloaders who have shot not only .45Super in stock, KKM, LWD, and other makes of barrels, but also have done extensive shooting with the formidable .460Rowland. These guys have shot .45Super and .460Rowland in both G21's and G30's. So, I wanted KKM's take on all this. Again, I have NEVER intended to shoot .460R, as it would probably break my 65-year-old, flimsy, feeble, decrepit, and bony little wrists, and put a rather large dent in my checkbook as well. What I really wanted to know was: Can I safely shoot .45Super (hell, I don't even have any of this ammo, and have never fired it in any gun in my life), using the KKM barrel in my G21SF. I figured the KKM bbl. would be the wiser choice, compared to the stock bbl., just because so many shooters seem to have gone this route. I also figured that the only other change I'd need to make would be a stronger RSA, maybe even with a steel guide rod, too. So here is what KKM said, in answer to my last e-mail: "Dear Mr. Arnold Kuhl: I would not shoot the 45 Super or 460 Rowland in any Glock ever. Kevin" Ok, guys. What say you? AK Wanna kill these ads? We can help!