The .32 ACP cartridge is also prone to a condition known as 'rimlock'. Because it is a semi-rimmed cartridge, a small portion of the extractor groove protrudes beyond the body of the case. This rim can catch on the extractor groove of the cartridge below it in the magazine. This generally slows the velocity of the slide and increases the likelihood of a malfunction. Rimlock is not a common occurrence with the P-32, but can occur if cartridges are not loaded carefully in the magazine. Magazines intended only for hollow-point ammunition may be modified to increase reliability and to prevent rimlock with the addition of a "flywire", available as an accessory from Kel-Tec. FMJ ammunition is not prone to rimlock; no magazine modifications are required for it to achieve maximum reliability.
