This is a magazine for the HLF HK UMP45 shell...
Outer barrel replacement for UMP 45..
NOTE: Gearbox wiring is slightly too short for the shell, hence you will need to extend/replace the ..
Full metal replacement rails for the front of your UMP. 3 metal rails to replace 2 stock plastic sid..
Aftermarket metal top rail replacement for the nylon UMP45 shell. Perfect for mounting heavy optics ..