[gxer]

Congrats on your purchase. I won't change the charging handle or mag release unless there's something wrong with them.

Get the long rhino rail (for 20 inch barrel), it will improve the attachment solution by a mile.

Some folks also got the bolt release from LI which I personally didn't care much about. If you think yours is very stiff then the LI bolt release will help.

Another common attachment you will find on other RDBs is the flared magwell. You can get one directly from KT (RDB Magwell - KelTec) or you can go with the one offered by Haga defense (KelTec RDB17 Flared Magwell). Personally if I'm only using 10 round mag then I won't bother with attaching one.

Bottom line, shoot it first, if you think something should be improved then go and do research on finding it. Otherwise you maybe spending money on needless things. Remember, RDB is a well designed product and has one of the best factory triggers out there. I would rather put that money into ammo.