[Nova youth 20ga bead coming loose]

Brand new Nova youth 20ga and after about 75 rounds through it the front bead is coming loose. Ever shot the bead moves and have to correct it. Can I use some sort of locking/split washer to correct this.

 

Thanks,

[Chokes for Steel shot for Nova youth]

Looking for a good choke for a youth 20ga nova that shoots steel. the IC and F chokes that came with it won't allow steel, just the M. Looing for a F or IM that shoots steel. I use Comp-N-choke tubes in my Berreta that I really like, and would prefer to use them but if anybody knows of something that they like let me know.

 

Thanks,