This is a specially shaped hop-up packing for the company's
CNC Hop Up Chamber AR15 ULTRA .
The material is nitrile rubber and the hardness is Shore A 55.
This hop-up pad does not have an airtight lip like Tokyo Marui electric handguns, the next-generation Mk46, and the next-generation MP5, and has a thick shape, aiming to improve airtightness, prevent entanglement during loading, and suppress excessive shape changes during firing.
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It has a standard protrusion shape, but is larger in the front and back compared to the genuine Tokyo Marui one.
The assembly to the company's CNC Hop Up Chamber AR15 ULTRA is quite tight.
Please install the parts with sufficient oil applied.
![[RETRO ARMS] Hop Up AEG rubber ROBUST NBR 55 Shore](http://rock-et.jp/cdn/shop/files/RETRO-9492_2_1024x1024.jpg?v=1750395878)
![[RETRO ARMS] Hop Up AEG rubber ROBUST NBR 55 Shore](http://rock-et.jp/cdn/shop/files/RETRO-9492_1_1024x1024.jpg?v=1750395878)
![[RETRO ARMS] Hop Up AEG rubber ROBUST NBR 55 Shore](http://rock-et.jp/cdn/shop/files/RETRO-9492_2_medium.jpg?v=1750395878)
![[RETRO ARMS] Hop Up AEG rubber ROBUST NBR 55 Shore](http://rock-et.jp/cdn/shop/files/RETRO-9492_1_medium.jpg?v=1750395878)
