Your local gunsmith has no idea what he is talking about. SLR is good stuff. I own and have installed several of these rails on some very accurate rifles. The gas tube has nothing to do with what the barrel does when a round is fired. Hence the gas block hanging off the end of the barrel would make the gun way less accurate than the SLR anti rotation pin if you wanna use that "gunsmith's" argument.
"Perfect Practice Makes Perfect"
"There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
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