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AR15.COM
12/21/2019 6:53:13 PM EDT
[Last Edit: Ranxerox911][Edited]
@RRAMODERATOR

I am hoping to use some LAR-8 accessories to upgrade my old BAR-10, and I'd like to know if the parts listed are backward compatible. Does anyone know if parts are a direct swap between the two?
Specifically, I'd to know if the following parts fit the BAR-10 with a 16" barrel length:
  • RRA LAR-8 Free Float Tube Mid-Length,  ITEM #: 308A0010CAH or 308A0010LMS RRA LAR-8 Lightweight Free Float Rail Handguard, SBR Length - it depends on the length; I'd prefer that the gas block remain exposed, but it is hard to tell where to locate the length measurement relative to where handguard would fit on the barrel

  • LAR-8 NSP CAR Stock Kit, Black ITEM #: 308A0250U

  • RRA LAR-8 Complete Bolt Carrier Group,  ITEM #: 308A0032AGRP - I have several thousand rounds through the original, but the heat treatment flaw from Bushmaster is still hanging over my head. I'd like to have a spare if they are compatible.

Thanks for any help
"When in trouble, when in doubt, run in circles, scream and shout."
12/23/2019 3:32:35 PM EDT
[Last Edit: RRAMODERATOR][Edited] [#1]
All will work on your BAR-10.
Once you go to the new carrier group, you'll be fully compatible with all of the current BCG components, and stocks, handguards, etc...will all retrofit as long as you're going LAR-8 pRTA to BAR-10 rifle..
You need ot use whichever length handguard that you have now.  If youhave a 16" barrel, thenyou can use any of the mid-length handguards and have them end just behind the gas blobk/front sight.
Steve/RRA
12/23/2019 9:19:59 PM EDT
[#2]
Thanks, Steve - glad to see you're still around.  One question: what does "pRTA" stand for?
"When in trouble, when in doubt, run in circles, scream and shout."
12/24/2019 12:30:34 PM EDT
[#3]
Quote History
Originally Posted By Ranxerox911:
Thanks, Steve - glad to see you're still around.  One question: what does "pRTA" stand for?
View Quote
My lack of sleep and staring at a screen for too long.  It is supposed to read "part".
3/26/2020 9:52:36 PM EDT
[Last Edit: Ranxerox911][Edited] [#4]
@RRAMODERATOR

Is there a set of installation instructions for the aluminum Free Float Tube?  The ones that came with the tube apply to handguards with a separate barrel nut, as opposed to a one-piece unit like what I have in hand.  It isn't clear how the correct torque on the nut is obtained - the barrel nut wrench for the LAR-8 barrel doesn't fit the free float tube's hole spacing, and it doesn't appear to have clearance next to the upper receiver in any event.

Is a strap wrench the tool Rock River had in mind to tighten the barrel nut/free float tube to the upper receiver?  Seems a bit sketchy if that's the case, considering what would happen if it were to come loose.  Any advice?
"When in trouble, when in doubt, run in circles, scream and shout."
3/27/2020 9:56:58 AM EDT
[#5]
You apparently have a classic if you have one of the one-piece tubes.  
You want to use a 2.5"+ nylon strap wrench , as cloe to the receiver as possible, for installation.
Have the gas tube assembly (gas tube still pinned into the gas block) off and use a punch from the inside  of the receiver to verify alignment of the gas tube throughway in the receiver and one of the gas tube through holes in the back of the tube.  Always tighten a little more rather than backing it off.  Then reinstall the gas assembly and you should be good to go, as ong as you get it back exactly where it was when you started.
Thanks.
Steve/RRA

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