I have version for push button sling adapter (http://www.brownells.com/.aspx/pid=2..._SLING_ADAPTER) on my MR223. It fits, but my E1 butstock can not lock in most forward position. Looks like HK buffer tube castlenut is slightly (some 1mm) longer than standard one or my buffer tube is screwed deeper into lower. Anyway no problem for me, as I use second position for my stock.



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