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Posted: 1/31/2011 8:45:26 PM EDT
I'm getting ready to order a Brick mod. and grenade ring for an SBR XM177E2 clone. Do I need an A1 lock washer somewhere on there or just tighten the mod. down on the grenade ring? Thanks.
Link Posted: 1/31/2011 8:50:32 PM EDT
No lock washer on the XM177E2
Link Posted: 1/31/2011 9:00:38 PM EDT
I know it's been said not to use the lock washer, but... from Ekie's USGI Colt Carbine parts variation guide:

"When the “grenade ring” is installed correctly it covers the lock washer (GAU-5/A/A and XM177E2 only):"


I don't know either way, just stoking the fire!
Link Posted: 1/31/2011 9:10:57 PM EDT
Originally Posted By madmanblake:
I know it's been said not to use the lock washer, but... from Ekie's USGI Colt Carbine parts variation guide:

"When the “grenade ring” is installed correctly it covers the lock washer (GAU-5/A/A and XM177E2 only):"
http://img.photobucket.com/albums/0603/Ekie12091941/Govt%20Carbines/variation%20guide/FS08.jpg

I don't know either way, just stoking the fire!

Ok now madman,,go ahead and install the lock washer,THEN see if the mounting lip of your XM148 will fit in there!!!!
NO LOCK WASHER USED,part of the reason for the wrench flats is so you can torque it to proper spec.

Link Posted: 1/31/2011 10:24:13 PM EDT
So the grenade ring acts as sort of an A2 crush washer?
Link Posted: 2/1/2011 4:46:05 AM EDT
Nope, just as a washer; which is enough.
Link Posted: 2/1/2011 8:47:02 AM EDT
No lock ring on mine. Few hundred shots and hasn't loosened up a bit.
Link Posted: 2/1/2011 4:02:42 PM EDT
Originally Posted By m1sniper:
Originally Posted By madmanblake:
I know it's been said not to use the lock washer, but... from Ekie's USGI Colt Carbine parts variation guide:

"When the “grenade ring” is installed correctly it covers the lock washer (GAU-5/A/A and XM177E2 only):"
http://img.photobucket.com/albums/0603/Ekie12091941/Govt%20Carbines/variation%20guide/FS08.jpg

I don't know either way, just stoking the fire!

Ok now madman,,go ahead and install the lock washer,THEN see if the mounting lip of your XM148 will fit in there!!!!
NO LOCK WASHER USED,part of the reason for the wrench flats is so you can torque it to proper spec.



Where does the mounting lip of the 148 go on a 20" rifle?
Link Posted: 2/1/2011 8:06:29 PM EDT
Torque spec?
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