I am working on getting a flat top AR for varmints and I am trying to find a truly GOOD way to carry it on my sled! I am considering either the Eberelstock or nimrod pack systems. I like the Eberelstock but the scabbard is not wide enough on the J104 and I havn't been able to try a J107. I also havn't been able to see a nimrod first hand for comparison. Any one have any ideas?