Springs and follower
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Remove the spring, paying attention to how it was attached to the follower.
Compare it with a 5.56 mag spring and see if the Grendel spring is longer.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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