Hello
I am cleaning up a CMPicon certified RA 1903a3 rifle with barrel date 8-43 that was rebuilt at RIA and noticed there are 3 rubber washers on the barrel after it was disassembled
I didn't notice were they where placed but I assume under the upper band and possibly under the clips on the correct A3 handguard

Ive never seen these before
Does anyone have feedback on these?
Maybe part of the rebuild process at Rock Island?
Accurizing perhaps?
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