The Mako Group’s KPOS G2 LB200 is an valiant attempt at making a pistol carbine conversion kit that, for legal reasons, does not convert the pistol into a carbine. Instead of having a buttstock the kit has an arm support. This is said to provide a more stable platform both when shooting two handed (on hand on the pistol grip and the other on the foreend) and one handed.
The kit is avalible for the Glock 18, 19, 22, 23, 25, 31, 32, 37, 38, 21 & 21 SF, the FN 57, the Jericho and the CZ Duty.