Absolutely nothing.
I have used them for nearly 10 years now and just installed a BE Meyers 249 ASR 4-prong on my KAC 16" SR15 Mod2 so I can eventually attach the Velos K I want to buy.
If you use high-temp nickel based anti-seize (2000F or higher) on the taper, it won't lock up.
I actually prefer to do just that and then twist the absolute F out of it as I tighten it. Then rotate the locking collar.
The contamination of cans getting stuck that I have seen was via the tapers not mating fully (too loose) and gas escaping through the taper. My threads all stay VERY clean. But I have never had my tapers leak, either.
As others have said, SiCO sells more cans than nearly every other maker combined, and often to neophytes who don't RTFM. These dummies will try to rotate the can on the threads with the locking collar in the 'locked' position (stripping the locking pawls, the teeth on the muzzle device, or both), barely tighten the damn thing, and then act surprised when 56,000 psi unscrews the GD can on their behalf.
I reiterate, people who RTFM rarely have any issues and SiCo stands behind their stuff. My first can was actually a Saker 762 with the now-dead ratcheting Saker mount. It failed and got stuck in the MAAD adapter.
One phone call to SiCo and a 2 day shipping label later and I had a new MAAD adapter and multiple new ASR muzzle devices, with a handwritten apology note. I stuck with ASR and never looked back.
Also, let's be clear, there are many HUB adapters now that don't even have a secondary locking mechanism at all, like Rearden & Xeno. And they work great, too. ASR has the taper AND the secondary locking collar.
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