Powder Residue on SLR Gas Block?

TheRussianNightmare · Dec 18, 2017

inkd said:
If you had to open the adjustment screw up as far as you are saying, I wonder if it's lined up properly? I have SLR's on all my rifles and don't have them opened as far as it sounds like yours is?

Is it cycling properly now?

It is lined up properly. I know because I used the SLR dimpling jig, which mounts in the gas port. I drilled and pinned it, with Chad's advice, and it is very secure.

As far as cycling, I need to inspect it thoroughly, as Chad suggested, and take it back to the range. I think I only had 1 or 2 jams in the last couple of 20 round mags.

I will update with any findings and improvements. Thank you all!

clandestine · Dec 19, 2017

TheRussianNightmare said:
It is lined up properly. I know because I used the SLR dimpling jig, which mounts in the gas port. I drilled and pinned it, with Chad's advice, and it is very secure.

As far as cycling, I need to inspect it thoroughly, as Chad suggested, and take it back to the range. I think I only had 1 or 2 jams in the last couple of 20 round mags.

I will update with any findings and improvements. Thank you all!

Believe it or not it's still possible that it's not alligned via the port itself. There is enough variables to still allow slight misalignment. Depending on the gas port size in the barrel, and other Alignment variables, the port could be off by as much as 15 degrees. Now wether or not that amount of misalignment is causing an issue is all speculation.

The only way to know for sure is to use a borescope and look via the bore and into the gas port.

TheRussianNightmare · Dec 19, 2017

clandestine said:
Believe it or not it's still possible that it's not alligned via the port itself. There is enough variables to still allow slight misalignment. Depending on the gas port size in the barrel, and other Alignment variables, the port could be off by as much as 15 degrees. Now wether or not that amount of misalignment is causing an issue is all speculation.

The only way to know for sure is to use a borescope and look via the bore and into the gas port.

Chad, have you used one of the SLR jigs? They are pretty cool and helpful for someone who doesn't have a machinist-like setup.

You can see the pointed screw that centers the jig on the gas port. Until right about now, I was pretty confident it was centered

However, I know you are correct. Sigh... I will have to pony up for another expensive rarely used tool (borescope) one of these days.

P.S. If anyone needs to borrow my once-used .936 SLR dimpling jig, let me know

. It's the older version, which dimples at .400" and .450" center, I think.

clandestine · Dec 19, 2017

TheRussianNightmare said:
Chad, have you used one of the SLR jigs? They are pretty cool and helpful for someone who doesn't have a machinist-like setup.

You can see the pointed screw that centers the jig on the gas port. Until right about now, I was pretty confident it was centered

However, I know you are correct. Sigh... I will have to pony up for another expensive rarely used tool (borescope) one of these days.

P.S. If anyone needs to borrow my once-used .936 SLR dimpling jig, let me know. It's the older version, which dimples at .400" and .450" center, I think.

I have the BRDE Jigs which are similar in design.

If you need the port checked with a bore scope, I can help once the holidays are past.

inkd · Dec 19, 2017

clandestine said:
If it won't cycle with the can it's overgassed and will need to be taked with some buffer/spring or an adjustable gas block.

Adding a can can suck for a big bore like a .308 AR. The SLR is almost a necessity if you suppress them.

Okay, 5 rounds to sight in and not a problem. I ran 20 rounds suppressed and had 2 failures to extract, both happened on the 7th round of the magazine with 2 different types of ammo.

I switched mags and ran another 10 rounds through it without a problem, with the suppressor installed.

Before I start looking at new gas blocks, I'm going to get a Tubbs spring for it and isolate the mag and run some other mags through it. All I have at the moment is Pmags.

I should probably start a new thread on this, I hate thread hijacks.

John from MD · Dec 19, 2017

When you say Failure to Extract, did the case come out of the chamber at all?

inkd · Dec 19, 2017

John from MD said:
When you say Failure to Extract, did the case come out of the chamber at all?

Yes, came partially out then jammed up. I first blamed it on the steel cased Herters ammo but it did it with brass cased ammo too.

This was the first 30 rounds of ammo through the gun since I put it together. I cut, threaded, chambered and drilled the gas port in a barrel building class in North Carolina. After a few rounds down there to test gas port sizes, I assembled it and it's sat in the safe ever since.

I've got some things to check out on it after the holidays. It'll give me something to do while I'm on break from school.

John from MD · Dec 19, 2017

Do yourself a favor. Don't change anything until you put a 100 rounds or so down the spout. On newly manufactured guns, sometimes you need to let the parts wear in a little before they become reliable.

Happy Holidays,

DaemonAssassin · Dec 20, 2017

TheRussianNightmare said:
Chad, have you used one of the SLR jigs? They are pretty cool and helpful for someone who doesn't have a machinist-like setup.

You can see the pointed screw that centers the jig on the gas port. Until right about now, I was pretty confident it was centered

However, I know you are correct. Sigh... I will have to pony up for another expensive rarely used tool (borescope) one of these days.

P.S. If anyone needs to borrow my once-used .936 SLR dimpling jig, let me know. It's the older version, which dimples at .400" and .450" center, I think.

You are welcome to use my bore scope, if you and Chad are unable to link up.

TheRussianNightmare · Dec 20, 2017

clandestine said:
If you need the port checked with a bore scope, I can help once the holidays are past.

Thank you for offer. I may take you up on that next month.

DaemonAssassin said:
You are welcome to use my bore scope, if you and Chad are unable to link up.

Definitely. Thank you.

clandestine · Dec 20, 2017

DaemonAssassin said:
You are welcome to use my bore scope, if you and Chad are unable to link up.

You picked up one? Very nice my friend.

Which one did ya get if I may ask?

DaemonAssassin · Dec 20, 2017

clandestine said:
You picked up one? Very nice my friend.

Which one did ya get if I may ask?

I went with the Lyman. It does the job well enough for my needs. As much as I'd like the one you have, I can't justify that cost with my infrequent use of the device.

I forgot to tell you, that 300BLK upper we built in CF1 for my buddy, it is sub-MOA capable. He was pretty well floored when I gave the upper to him. He hopes that one day when his schedule allows for it, the 3 of us can link up so he can thank you in person for your part in the upper. Mission BBQ, maybe?

clandestine · Dec 20, 2017

DaemonAssassin said:
I went with the Lyman. It does the job well enough for my needs. As much as I'd like the one you have, I can't justify that cost with my infrequent use of the device.

I forgot to tell you, that 300BLK upper we built in CF1 for my buddy, it is sub-MOA capable. He was pretty well floored when I gave the upper to him. He hopes that one day when his schedule allows for it, the 3 of us can link up so he can thank you in person for your part in the upper. Mission BBQ, maybe?

I would be honored.

The lyman is a good borescope for the price they ask.

DaemonAssassin · Dec 21, 2017

clandestine said:
I would be honored.

The lyman is a good borescope for the price they ask.

I'll keep you posted on when he comes into town again.

I really like the Lyman. It shows the bore clearly, allows for the alignment of the block without an issue, visually it is good, and it is quite fun seeing the look on somebody's face when they see a bit of copper fouling in the bore and think it is rust. Oh and I keep it stored in the box it was shipped in. No sense in trying to find a Pelican for it, when I am already having a hard enough time finding a a Pelican for a Vortex Diamonback plus tripod.

Powder Residue on SLR Gas Block?

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