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Ron, Probably not be able to find them until the scamdemic issues are over.
Ron, these are about as rare as hens teeth currentlySir. I would check on large gun and accessory sites like (6)un (8)roker as discontinued and hard to find firearms and accessories show up for sale by private individuals and small shops. Just replace (6) & (8) with G & B.
It looks like molon labe industries has them in stock http://molonlabeindustries.com/products/ruger-sr-556-300black-barrel-kit.html Also SOSS has complete pistols in stock Ruger AR-556 300 Blackout Semi-Automatic Pistol with SB Tactical Stabilizing Brace https://www.sportsmansoutdoorsuperstore.com/products2.cfm/ID/222178/8572/ruger-ar-556-300-blackout-semi-automatic-pistol-with-sb-tactical-stabilizing-brace
