Well I put a rail level on my Benji Trail NP .22.. The level was put on to help me overcome my canting errors, and it works. My consistency has improved. Happy me...the problem I have is the bubble seperates after most of the shots and I have to wait for it to "regroup". The level was inexpensive $10....cheap level or that's just the way it is? Are the tube mounted levels better? I'm wondering if any of you have had this situation. Thanks