Review: S3F Solutions MK 601 Upper Receiver

1,712 views · Published 26 August 2014 · 7:20 · Indexed 17 October 2026

Channel: SageDynamics · 2014 · Education

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Sage's Aaron Cowan takes a look at the S3F Solutions MK 601 upper receiver; its benefits and potential drawbacks as an option for those in the market for a ready assembled upper receiver.

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