HK CLONE TALK CKFSCKFS Mar 16, 2024 UMP 9mm magazine clamp/coupler Hi Everyone I am rather new to UMP system. Just wondering is there any magazine clamp/coupler for 9mm magazine? Just like https://hkparts.net/christmas-sale/hkp-hk-ump-45-ump-40-dual-magazine-clamp/ Thanks in advanc...