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POF use SEF trigger group not compatible with ambi selector, you need get a complete ambi trigger group.
Like this https://www.hkparts.net/shop/pc/MP5...-Navy-Housing-0-1-Safe-Semi-Only-89p17238.htm
Like this https://www.hkparts.net/shop/pc/MP5...-Navy-Housing-0-1-Safe-Semi-Only-89p17238.htm