This is a M4 (M16, AR-15 or similar) delta ring for airsoft rifles (AEGs).
The replica it was used on is a CYMA CM.513. It fits many other replicas with the same mounting style.
It does not include the other ring that is attached to the handguard.
For airsoft use only!
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Check the whole build here: https://www.printables.com/social/568524-mladendeni/collections/471362
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Any thoughts and recommendations will be appreciated!
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If you like my work you can buy me a coffee.
The author marked this model as their own original creation.