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It has come to our attention that CMC triggers do not perform with our upper system.
Light strikes is the problem reported with CMC triggers.
The CMC trigger is engineered to work with AR-15 rifles firing 5.56 Nato or .223 Remington cartridges,
and is not intended to work with other cartridges.

The fine folks at CMC have told me they will replace the hammer spring with a stronger one at no charge.
If you are ordering a CMC trigger for our upper, call in the order and request a stronger hammer spring.
While this may reduce light strikes, there is no guarantee either from CMC or Ray-Vin.

We test our uppers using mil-spec triggers and hammers.