The endcaps for the gas tube and the lower handguard don't line up. Im including a couple of pictures. What I'm wondering is whether this because the gas tube endcap is too far forward, the lower handguard is too far back (with the dimple milled too far back into the barrel), or what. I'd really like to get them to line up and look a little cleaner, because otherwise the rifle is fine. It's really stiff to charge, how can I fix that?