DDM4/SLiM rail anti-rotation problem?

**Nocalsocal** · 11-13-16, 11:43

Originally Posted by Rob Ski

Guys, to make it clear, when I started using this rifle, bolts were not lose. They were all tight.
They didn't become lose from recoil either. Many rounds went down the pipe on that rifle prior drops on concrete and rail was holding up. Bolts went lose after drops only.
I have them on blue loctite now and so far I haven't noticed any shifts.

Thanks for the clarification and great channel btw!

Anybody have any idea why DD doesn't recommend any threadlocker? Or any confirmation on the use of helicoils or other methods?

Sent from my iPad using Tapatalk

**justin_247** · 11-13-16, 12:07

Originally Posted by Rob Ski

Guys, to make it clear, when I started using this rifle, bolts were not lose. They were all tight.
They didn't become lose from recoil either. Many rounds went down the pipe on that rifle prior drops on concrete and rail was holding up. Bolts went lose after drops only.
I have them on blue loctite now and so far I haven't noticed any shifts.

Just to double-check, did only the rail shift or did the entire barrel nut shift?

**Rob Ski** · 11-13-16, 18:07

Originally Posted by justin_247

Just to double-check, did only the rail shift or did the entire barrel nut shift?

Justin, only rail moved. DD is using separate little bracket which is holding bolts and it is isolated from the barrel nut to some degree.

**Waylander** · 11-13-16, 19:08

Originally Posted by t15

I don't own any of the new DD rails, but I believe the plate is aluminum. Maybe it is exactly as IG said and the plate has helicoils.

Iraqgunz did not state the DD rail uses helicoils. He was referring to different manufacturers' rail systems that use helicoils.

**joeyjoe** · 11-13-16, 19:19

Not sure if the DD bolt up plate is steel or aluminum, but i know the barrel nut is steel.

**XM15M4Guy** · 11-13-16, 20:49

Originally Posted by Rob Ski

Justin, only rail moved. DD is using separate little bracket which is holding bolts and it is isolated from the barrel nut to some degree.

Hi Robski,

Did you see any reason not to loctite the bolts? Also, did you put the loctite on the entire bolt thread length?

Thanks

**Rob Ski** · 11-14-16, 06:02

Originally Posted by XM15M4Guy

Hi Robski,

Did you see any reason not to loctite the bolts? Also, did you put the loctite on the entire bolt thread length?

Thanks

Yes, I do have blue loctite on bolts now, but I put it only on the tip of bolts (just a tip - lol), enough to get that blue color on threads.
I honestly don't see reason for not using blue loctite here, unless I'm missing something.

**bowman57_2** · 11-15-16, 10:32

Originally Posted by Rob Ski

Yes, I do have blue loctite on bolts now, but I put it only on the tip of bolts (just a tip - lol), enough to get that blue color on threads.
I honestly don't see reason for not using blue loctite here, unless I'm missing something.

Are you planning on doing another drop test now that the bolts have loctite on them?