SLR rifleworks rail and adjustable gas block - possible issue(s)?

**voodoo_man** · 5 February 2016, 04:08

Originally Posted by mtdawg169

Glad you got the accuracy issue worked out. But I'm sort of surprised that a gas block won't clear a rail from the same manufacturer.

I had a DD low pro gas block and it didn't even remotely clear it so I decided to purchase a gas block directly from to make sure it had no such issues, unfortunately that wasnt the case.

Originally Posted by alamo5000

I would be interested to see the pics.

What did you have attached to the rail? What was striking?

I have photos that I may post later. I will do a whole review of the gas block and rail together before I ship them out.

**mtdawg169** · 5 February 2016, 04:17

Originally Posted by voodoo_man

I had a DD low pro gas block and it didn't even remotely clear it so I decided to purchase a gas block directly from to make sure it had no such issues, unfortunately that wasnt the case.

I have photos that I may post later. I will do a whole review of the gas block and rail together before I ship them out.

Yeah, the DD blocks are on the large side. Still surprises me that the Sentry won't clear an SLR rail. I wonder if any block clears without touching? I built up an 18" Noveske for a friend last year with a pinned Noveske block and an SLR Rifleworks rail. I don't recall that one having any issues.

**voodoo_man** · 5 February 2016, 04:33

Originally Posted by mtdawg169

Yeah, the DD blocks are on the large side. Still surprises me that the Sentry won't clear an SLR rail. I wonder if any block clears without touching? I built up an 18" Noveske for a friend last year with a pinned Noveske block and an SLR Rifleworks rail. I don't recall that one having any issues.

The Geissele SGB doesnt clear either...

**Joelski** · 5 February 2016, 04:56

What receiver? Could thr barrel nut threads not be perpendicular with the face of it? Could it have been previously damaged? Sounds like an issue with the mounting point...

**mtdawg169** · 5 February 2016, 05:08

Originally Posted by voodoo_man

The Geissele SGB doesnt clear either...

That one actually doesn't surprise me. It's a beefy GB.

**Joelski** · 5 February 2016, 05:23

Originally Posted by mtdawg169

That one actually doesn't surprise me.e. It's a beefy GB.

But he said it's under a Geissele rail, so it should fit just fine. I use a SGB under a Mk 4 and if has plenty of clearance.

**mtdawg169** · 5 February 2016, 05:25

Originally Posted by Joelski

But he said it's under a Geissele rail, so it should fit just fine. I use a SGB under a Mk 4 and if has plenty of clearance.

It is now. I assumed he meant that it didn't clear the SLR rail.

**voodoo_man** · 5 February 2016, 07:08

Cmt upper

**mtdawg169** · 5 February 2016, 07:20

Originally Posted by Joelski

What receiver? Could thr barrel nut threads not be perpendicular with the face of it? Could it have been previously damaged? Sounds like an issue with the mounting point...

I've seen that before with URX rails. You can see the rail misalignment, if it exists, by eyeballing it from the muzzle. But it honestly just sounds like the internal diameter of the rail is small. I've run into the same issue with a Centurion CMR before. Skinny rail, skinny internal dims, needs a really slim GB to free float.

**Slippers** · 5 February 2016, 07:39

Yes, the ID on the SLR rails is very small, just like an original CMR. Newer CMRs are opened up a bit. You almost have to use a gas block for a .625 journal (that isn't the same OD as a .750 gas block), or a shaved FSB. Badger also makes a very, very low profile gas block, smaller on the bottom than anything else I've seen.

**mtdawg169** · 5 February 2016, 07:55

Originally Posted by Slippers

Yes, the ID on the SLR rails is very small, just like an original CMR. Newer CMRs are opened up a bit. You almost have to use a gas block for a .625 journal (that isn't the same OD as a .750 gas block), or a shaved FSB. Badger also makes a very, very low profile gas block, smaller on the bottom than anything else I've seen.

I had one of the original CMRs. Thanks for the info on the newer ones. Glad to know they opened it up a bit. I've always liked the CMR rails and the new mlok & keymod versions should be a big hit for them.

**SINNER** · 5 February 2016, 08:15

Just a FYI, the CMMG micro's are the smallest gas blocks I have ever found. PRI makes a very compact one also but they are often very hard to find.

**Stone** · 6 February 2016, 06:40

Ballistic advantage makes a real low profile gas block as well. http://ballisticadvantage.com/750-lo-pro-gas-block.html

**voodoo_man** · 6 February 2016, 07:09

I'm not going to be putting it back together, and I'll be selling the slr rail and the gas block with a disclaimer attached. I'll actually be doing a write-up on the whole thing on my site before I do so - Now that I know of an issue I would consider myself at fault if others experience it when they could have been educated.

**SINNER** · 6 February 2016, 07:51

How much you asking for the gas block?

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