FSB's in 2020?

[JediGuy]

And then the EMP hit

[ST911]

For gas blocks, in order of preference... 1) uni-directional taper pin (per spec), 2) set screw in a dimple, staked or high temp locker, 3) everything else. There's really no need to do anything other than 1 or 2.

[Straight Shooter]

Whilst on the subject of Gas Blocks..has it been established..as far as ACCURACY goes..as to which method is better for precision shooting?

[JediGuy]

Whilst on the subject of Gas Blocks..has it been established..as far as ACCURACY goes..as to which method is better for precision shooting?

Criterion, as I recall, states that they believe the pin is detrimental to accuracy. I have yet to see anything objective. Their logic isn’t flawed, as far as I can tell, though.

[jbjh]

Who makes that handguard?

And yes, I still prefer FSBs with red dots.

SLR made that one.

https://slrrifleworks.com/


Sent from 80ms in the future

[Diamondback]

For me it depends on the app... for magnification or optics-on-bench lo-pro it, if it's a "mid-range or less" Combat or CQB and there's a chance of seeing it get knocked around I want an FSB for durability. If it's bump-in-the-night or BOB and needs quick deployment, I want FSB for the reduced moving parts to deploy, especially if I have a sidefolder to deal with.

That said, I've been toying with an idea if I could find a manufacturer... an all-in-one light-laser-BUIS, something like an Insight M6X mounted upside-down on a top-rail with a sight post and wings on top of it, all three components stacked on the centerline.

EDIT: Of my three-and-a-half (the "half" is a mockup on an unmachined 80%), only one doesn't have an FSB, and of the next four under consideration (12.5" "GL/SSC-ish," M16A4 and C7A2, Holland) only one would be joining it.

[sinister]

MSG Jared Van Aalst (KIA, RIP) was one of my NCOs, formerly of the 3rd Ranger Battalion, the USAMU, the infantry sniper school, and Delta. He stated there was definitely a shift with the SPR's rail-mounted front sight if you leaned into the bipod for distance shots.

[PracticalRifleman]

How many set screws have broken?

Cross screws bend and stretch as they're tightened, placing them under undue strain.

Set screws compress and the gas block is pulled tight against the gas port giving a better gas seal. Dimple the barrel, use a good set screw, stake them in place and they won't shoot loose.

A quality clamp on gas block isn't a horrible choice- in fact, a good clamp on gas block is a good choice. But taking in the details, a quality set screw gas block is better.

When I build a rifle, I drill dimples for the gas block set screws. Then I drill for a taper pin. Then I stake the gas block set screws. I’ve never had trouble with in coming loose and never had trouble getting one off.

I had a friend that had to grind off a popular brand’s gas block that was secured with a thread-locking compound because it wouldn’t budge with soaking in carbon remover, hammer taps, or Bob Smith’s Uncure. He eventually stripped both set screws and took the belt grinder to it.


Sent from my iPhone using Tapatalk

[MontanaMarine]

I still prefer a FSB. I've got 13 uppers, and 11 have a FSB.

If the barrel shifts from strain or heat, the front sight is still in the same relation to the bore.

Plus it's pretty darn solid.

[17K]

All of mine have a FSB.