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The hop-up chamber made of polymer ensures perfect tightness and thanks to the Rotary system, it ensures precise adjustment of BB spin.Dedicated to M4 type replicas.
![Rotary Hop-Up Unit M4M16 [SLONG AIRSOFT]](http://forairsoft.com/cdn/shop/files/czesci-wewnetrzne-komory-hop-up-komora-hop-up-rotary-m4-m16-slong-airsoft-178871_1-1.jpg?v=1761649092&width=1445)
![Rotary Hop-Up Unit M4M16 [SLONG AIRSOFT]](http://forairsoft.com/cdn/shop/files/czesci-wewnetrzne-komory-hop-up-komora-hop-up-rotary-m4-m16-slong-airsoft-178871_2-2.jpg?v=1761649092&width=1445)
![Rotary Hop-Up Unit M4M16 [SLONG AIRSOFT]](http://forairsoft.com/cdn/shop/files/czesci-wewnetrzne-komory-hop-up-komora-hop-up-rotary-m4-m16-slong-airsoft-178871_3-3.jpg?v=1761649093&width=1445)
![Rotary Hop-Up Unit M4M16 [SLONG AIRSOFT]](http://forairsoft.com/cdn/shop/files/czesci-wewnetrzne-komory-hop-up-komora-hop-up-rotary-m4-m16-slong-airsoft-178871_4-4.jpg?v=1761649095&width=1445)