Playbooks

Strong Slot Close is the condensed 21 personnel look in Pistol, and it plays completely differently from the spread out Pistol sets that stretch defenses horizontally. You get two backs in the gun alignment (the fullback or second running back offset next to the quarterback in the pistol depth), a tight end attached, and the slot receiver tucked tight to the formation rather than split wide. That compression forces defenses into tighter alignments, shrinks throwing windows for underneath zone droppers, and gives your outside receiver a genuine one on one on the boundary with the entire field to work into.
The value of the set is disguise. Because the personnel screams run (two backs, tight end, condensed slot), most opponents answer with single high shells and heavier boxes, which is exactly what Strong Power, HB Counter, HB Stretch Alert Dragon, and HB Dive want. Off that same look, PA Boot Lt and PA Deep In sell the same downhill footwork before flipping the quarterback outside the pocket or pushing a deep dig into the vacated middle. Mills gives you the post and dig combo that eats single high coverage alive, and WR Smash is your Cover 2 and Cover 4 answer with the corner route sitting on top of the flat defender.
The gadget element comes from F Lead Read Option, which weaponizes the pistol alignment by putting a lead blocker in front of the read and forcing the unblocked edge defender to commit before the mesh point. With the 3DRB and Power HB tags in play, you can rotate a receiving back into the F spot to attack man coverage with a linebacker matched up in space, or leave your bruiser in there and pound the interior. The tight slot alignment also means your SLWR gets a free release inside against most man looks since the defender has less room to press cleanly.
Establish the run first. Strong Power and HB Counter on early downs make the play action shots off PA Deep In and Mills far more effective later in the game.
Read the safeties pre snap. Single high means Mills or F Lead Read Option, two high means WR Smash with the corner route working over the flat defender.
Motion the slot receiver across the formation to identify man versus zone, then hot route accordingly (drag against man, sit or curl against zone).
On third and short, use HB Dive or F Lead Read Option rather than a dropback concept, since the personnel and compression give you a numbers advantage at the point of attack.
Block your fullback or add a chip against known blitz teams before running PA Boot Lt, and consider hot routing the back to a flat route as your outlet if pressure gets home.