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It really depends on the geometry of the trigger group. Aftermarket groups may not replicate the geometry and therefore timing of the factory item.

If the bolt is going right back to the buffer, then the hammer should be cocking. If it's not, then perhaps the trigger adjustments are too fine and it's not catching the sear and is following the...

You can use a spring balance to measure the force required at the cocking handle to cock the action with the Timney trigger group and then the standard group fitted. If the Timney requires...