FSB's in 2020?

[Five_Point_Five_Six]

This 20” BCM upper with Trijicon TA31F-G is my favourite rifle I own.

I'm almost to the point in my life where I either want a 10.5/11.5" with the option to suppress or a 20". I'm finding less and less desire to shoot anything 14.5 or 16". I either want them short and quiet or long with all the FPS.

[Glock9mm1990]

I'm almost to the point in my life where I either want a 10.5/11.5" with the option to suppress or a 20". I'm finding less and less desire to shoot anything 14.5 or 16". I either want them short and quiet or long with all the FPS.

I was in the same position as you, ether a 11.5” or a 20”. I went with the 20” and I am glad I did.

[Disciple]

I thought the answer to "ether a 11.5” or a 20”" was "Yes."

[Saber329]

I'm almost to the point in my life where I either want a 10.5/11.5" with the option to suppress or a 20". I'm finding less and less desire to shoot anything 14.5 or 16". I either want them short and quiet or long with all the FPS.

Coming to the same conclusion.

I'm partial to the 20" bbl and A2 stock, because that's primarily what I carried during OSUT.

[Five_Point_Five_Six]

I was in the same position as you, ether a 11.5” or a 20”. I went with the 20” and I am glad I did.

No I mean having both.

[Cokie]

FSB’s are great and still very serviceable in 2020. I’ve wondered about rails a lot in the past, and my favorite setup currently is a 10.3” RAS setup. I picked up a Daniel defense upper with a pinned block; I haven’t shot it much, but I have a hard time imagining it being any worse than a FSB setup. Shaved block on an 11.5” FBI barrel isn’t going anywhere. I assembled an upper that had the gas block walk some, so I aligned it again, shot some rounds through it, checking it and torquing a little while it was hot. No idea if that’s good or bad but it worked. I wouldn’t trust my life to an unpinned block though. I would trust rail mounted irons.

[Core781]

FSB’s are great and still very serviceable in 2020. I’ve wondered about rails a lot in the past, and my favorite setup currently is a 10.3” RAS setup. I picked up a Daniel defense upper with a pinned block; I haven’t shot it much, but I have a hard time imagining it being any worse than a FSB setup. Shaved block on an 11.5” FBI barrel isn’t going anywhere. I assembled an upper that had the gas block walk some, so I aligned it again, shot some rounds through it, checking it and torquing a little while it was hot. No idea if that’s good or bad but it worked. I wouldn’t trust my life to an unpinned block though. I would trust rail mounted irons.

It’s okay as long as you machine or drill small divots for the adjustable gas block/FSP set screws: and you do not over torque your set screws. Otherwise you will almost certainly deform the barrel while its hot as you tighten the set screws into the barrel. It will permanently alter the bore and effect pressure and rifling. It’s best to taper pin any gas block and by milling it to the barrel while aligned properly. Two taper pins as used in the military FSP is vastly superior to alternatives.

[opngrnd]

I have had a gas block with knurled set screws and a dimpled barrel come loose before, despite using red loctite on the set screws. At this point, everything gets pinned, whether it's a low profile gas block or by using a FSB.

[ColtSeavers]

I have had a gas block with knurled set screws and a dimpled barrel come loose before, despite using red loctite on the set screws. At this point, everything gets pinned, whether it's a low profile gas block or by using a FSB.

How dare you disparage set screw gas blocks in dimples by providing a first hand account of a failure.
You are supposed to anecdotally attack clamp on gas blocks.

[Core781]

I have had a gas block with knurled set screws and a dimpled barrel come loose before, despite using red loctite on the set screws. At this point, everything gets pinned, whether it's a low profile gas block or by using a FSB.

You forgot to use high temp sleeve retainer when you installed the block. 🤣🤣 😝

Also remember to clean all oil off a steel gas block and barrel it will oxidize and hold tighter. Most set screw gas blocks come with too soft set screws. And yes I will not use them period: after going through all the process you end up with a gas block that is inferior to a pinned gas block.