Kahr makes a fine weapon, my wife has a P40. I would suggest a normal sized Kahr Like the P9, I think your wife will find it easyer to shoot than the smaller Kahrs.

Quoted: I have two questions: 1) What is the MK "box" 2) How does the P9 compare in size to a G36 Thanks

GLOCK 36

Caliber .45 Auto  Safe Action System
Length (slide) 6.77 in.          172 mm   Kahr 6.1 in.
Height 2)  4.76 in.          121 mm         Kahr 4.55 in.
Width  1.13 in           28.5 mm.            Kahr .94 in.
Length between sights 3)  6.18 in.          157 mm
Barrel length  3.78 in.           96 mm
Barrel rifling  right, octogonal
Length of twist  15.75 in.        400 mm
Magazine capacity 4)                 6
Empty without magazine  20.11 oz.         570 g  Kahr 16.8 oz.
Empty magazine     2.40 oz.          68 g
Full magazine 5)   ~6.88 oz.       ~195 g
Trigger pull (standard)  ~5.5   lbs.      ~2.5 kg
Trigger travel for discharge 6)    0.5   in.        12.5 mm


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KAHR P40

Caliber   .40 S&W
Capacity 6 + 1
Operation Trigger cocking DAO; lock breech; "Browning - type" recoil lug; passive striker block; no magazine disconnect
Barrel 3.5", polygonal rifling; 1-16 right-hand twist
Length O/A 6.1"
Height 4.55"
Slide Width .94"
Weight Pistol 16.8 ounces, Magazine 1.9 ounces
Grip Textured polymer
Sights Low profile, white bar-dot combat sights (tritium night sights optional)
Finish Black textured polymer frame, matte blackened stainless steel slide with Tungsten DLC
Magazines 2-standard, 6-round