Gas block pinning options

[Dildobaggins]

Finishing up a SHTF build. I have a criterion core barrel that I'm going to send to ADCO for them to pin a gas block. Looking for suggestions on said gas block. I'd like a .625 low profile, non adjustable. Any suggestions? Are all gas blocks in this arena created equal?



Thanks fellas

 

[TonyTheTiger]

Avoid aluminum. Beyond that, any steel block with a reasonable fit is the same as the rest as far as I can tell.

 

[msgriff]

Most gas blocks will work, but you should ask ADCO, Last I heard they had an aversion to drilling anything nitride or QPQ, but that was a couple years ago. Griffin has a pre-drilled block, but some prefer to "match" drill.

 

[Ernest 5.56]

Sorry wrong size it's a .750

GBF .750-GBF .750

 

[Dildobaggins]

Most gas blocks will work, but you should ask ADCO, Last I heard they had an aversion to drilling anything nitride or QPQ, but that was a couple years ago. Griffin has a pre-drilled block, but some prefer to "match" drill.

I like those griffens. Would you happen to know the set screw spacing? I already have my barrel dimpled.

 

[TheOE800]

Sorry wrong size it's a .750

GBF .750-GBF .750

I wouldn’t pay duckman that much for his gas block, the premium is way too big. Worth mentioning I have seen and heard tell of VLTOR and BCM blocks failing in the last year so there’s clearly some metallurgy issues slipping through QA in the more premium/usually reliable side of the house.

It’s odd, but I get consistently tight bores out of Wilson’s no frills gas blocks. They are easy to drill as well though I have a drilling jig.

 

[Dildobaggins]

I wouldn’t pay duckman that much for his gas block, the premium is way too big. Worth mentioning I have seen and heard tell of VLTOR and BCM blocks failing in the last year so there’s clearly some metallurgy issues slipping through QA in the more premium/usually reliable side of the house.

It’s odd, but I get consistently tight bores out of Wilson’s no frills gas blocks. They are easy to drill as well though I have a drilling jig.

Interesting. Maybe I'll end up with a cheap aero gasblock. Never had problems with them.

 

[TheOE800]

Aero has better QC than LMT so it’s not like a terrible choice or anything.

Not my brand of choice but I won’t stop you.

 

[USK308]

+1 on what @TheOE800 said! I have drill jigs for gas blocks myself. EASY task that won't take more than 30 minutes if you are mega-slow and take a 10 minute break (lol)
Just make sure the gas block is 100% accurate in location, mark with a pencil or silver sharpie, then line up the jig hole(s) and drill using the jig!

 

[Ernest 5.56]

TITANIUM PIN-ON GAS BLOCKS

 

[Ernest 5.56]

Interesting. Maybe I'll end up with a cheap aero gasblock. Never had problems with them.

If you tested fit and it's tight it should be fine I think school of the black rifle has a video about it on YouTube

 

[Dildobaggins]

+1 on what @TheOE800 said! I have drill jigs for gas blocks myself. EASY task that won't take more than 30 minutes if you are mega-slow and take a 10 minute break (lol)
Just make sure the gas block is 100% accurate in location, mark with a pencil or silver sharpie, then line up the jig hole(s) and drill using the jig!

Well shit, now I might just do it myself. What jig are you using?

 

[msgriff]

I like those griffens. Would you happen to know the set screw spacing? I already have my barrel dimpled.

Not off the top of my head. There are at least 5 different set screw spacings, a major reason why I don't like barrels that come with 2 dimples.

 

[Dildobaggins]

Not off the top of my head. There are at least 5 different set screw spacings, a major reason why I don't like barrels that come with 2 dimples.

Unfortunately, I did the second simple myself. The criterion core only comes with one. Should have left it and pinned it how it was. Oh well.

 

[USK308]

Well shit, now I might just do it myself. What jig are you using?

SLR dimple jigs (they have different sizes, based on gas port size, ex. .750). I also had to buy carbon steel 5/32" drill bit to do the drilling.

SLR .750 Dimple Jig

 

[Dildobaggins]

SLR dimple jigs (they have different sizes, based on gas port size, ex. .750)

SLR .750 Dimple Jig

My bad. I have a dimpling jig. I was looking for a jig to be able to pin a gas block.

 

[USK308]

My bad. I have a dimpling jig. I was looking for a jig to be able to pin a gas block.

I did a double-dimple using my SLR jig, then some loctite in both of the set screws and the gas block on my AR308 is solid! No movement whatsoever after probably 800 rounds...

I went this route rather than pinning as it was easier for me to do on my own.

But, if you do want to pin your gas block, there is this article that may help

http://modernserviceweapons.com/?p=5209

 

[USK308]

My bad. I have a dimpling jig. I was looking for a jig to be able to pin a gas block.

Another pinning jig...

pinning jig