Roller handle - available in plastic(Stock#22183)or aluminum(Stock#17950) grip, reduces fatigue during long reloading sessions.
Strong mount(Stock#22051) - if your bench is either too low for comfortable use, or you need to access drawers underneath, the strong mount elevates the entire machine above your bench top. Raises height of the RL 550B to 29 1/2".
Bullet tray(Stock#22214) - only usable with the strong mount, the bullet tray elevates the bullets to the level of the shellplate for easier reach.
Empty Case Bin and Bracket(Stock#11185)-Attaches to the Strong Mount, elevates empty cases to the level of the shellplate for easier reach.
Low powder alarm(Stock#16306) - warns you both audibly and visibly when powder level in the measure gets low.
Extra small bar(Stock#20780) throws down to about .5 grain
Magnum bar(Stock#21353) throws up to 73 grains of extruded and 82 grains of ball/spherical powder.
Belted Magnum Powder System(Stock#97126)- Throws over 110 grains of powder, Comes with the oversize powder die needed for calibers too large in diameter to fit in the standard powder die.
The RL550B can load rifle and bottleneck pistol as well as straight walled pistol cartridges. It uses conventional 7/8 - 14 threaded dies, and offers greater versatility and a slightly faster rate of reloading over the Square Deal 'B'.
I suggest that you also get -
Dillon dies designed for high speed use
Extra primer pick-up tubes, if loading more than 100 - 200 rounds per sitting, and a machine cover to keep it dust free