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Page AR-15 » AR Basics
AR Sponsor: bravocompany
Posted: 4/28/2024 5:00:14 PM EDT
I am putting a rearden R2S onto my 16" daniel to host a polonium k suppressor with atlas mount. The R2S threads fine all the way to the shoulder. Is a shim needed or am I good to torque directly to shoulder?
Link Posted: 4/28/2024 5:31:07 PM EDT
[#1]
From their webpage:

Shims not included, if you would like to specifically time this, shims will be required.
Note: your barrel may require a shim if the manufacturer did not put a thread relief on it.
Link Posted: 4/28/2024 5:36:24 PM EDT
[#2]
Yes ive read that. It doesnt need timing, and it does not have a thread relief cut into it. I guess im asking what should I be looking for to determine if my barrel may need one?
Link Posted: 4/30/2024 10:09:39 AM EDT
[#3]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Strider_z71:
Yes ive read that. It doesnt need timing, and it does not have a thread relief cut into it. I guess im asking what should I be looking for to determine if my barrel may need one?
View Quote


How much torque are you putting on it right now?  5, 10, 20, 30#?
Link Posted: 4/30/2024 5:31:35 PM EDT
[#4]
None yet, plan to torque to 25
Link Posted: 5/2/2024 6:43:14 AM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Strider_z71:e fuel
Yes ive read that. It doesnt need timing, and it does not have a thread relief cut into it. I guess im asking what should I be looking for to determine if my barrel may need one?
View Quote


Look at the barrel under the threads to see if tbey are relief cut or if the barrel just flares out at the base of the threads before the full barrel profile.

Link Posted: 5/2/2024 6:56:46 AM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Strider_z71:
Yes ive read that. It doesnt need timing, and it does not have a thread relief cut into it. I guess im asking what should I be looking for to determine if my barrel may need one?
View Quote

I've always used shims when no relief cut is present, timed devices or not.

So long as the mount indexes on the barrel shoulder and the shoulder is perpendicular to the bore it should be fine.
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