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Fn 509 adapter plates

ton809

ton809

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So I just got my fn509 mRD, it had a acro plate, now I want to add a rmr to add my 507 comp but I didn’t realize the oem adapters are polymer, does anyone have experience with these, I’ve never seen any polymer adapters.. I also don’t want to spend 100 for an aluminum/steel version.
This is my HD/occasional range use.
Basically are the polymer ones worth it/reliable
 
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