I took the muzzle brake off mine and because 90% of the negative reviews on the sfar have been related to the gas regulator I decided to nip that at the bud and I put an AR15 adjustable gas block and rifle gas tube on it. I have no plans to shoot suppressed so I don’t need their 3 position regulator.
On a side note, I’ve heard some people call the SFAR an AR10. It is NOT an AR10. It’s the exact same size and length as an AR15. For example below is an AR15 lower on the SFAR upper. They accommodate the larger magwell by moving the trigger group and grip backwards about a 1/4”..
I haven’t tried swapping any parts other than the gas block and gas tube but it appears to me that the trigger, safety selector, takedown pins, buffer, handguard, barrel nut, gas tube, gas block, grip, charging handle, ejection port cover, mag release, and forward assist are all compatible with standard AR15 parts.
Parts that seam to be proprietary are pretty much the whole BCG, the upper and lower obviously, the bolt release, and the buffer tube which is slightly longer than a regular carbine buffer tube to accompany the longer bolt travel
Here is the SFAR bolt next to an AR15 bolt
I have another one in 308 coming this week that I’m going to be taking apart to rebarrel in 375 raptor after harvesting the barrel extension off the original barrel. Wish me luck!
