![[5KU] CNC Aluminium Hop Up Chamber[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_CNCAluminiumHopUpChamber_ForWAM4GBBSeries.jpg?v=1617875337&width=1200)
![[5KU] CNC Aluminium Hop Up Chamber[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_CNCAluminiumHopUpChamber_ForWAM4GBBSeries.jpg?v=1617875337&width=450)
![[5KU] CNC Aluminium Hop Up Chamber[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_CNCAluminiumHopUpChamber_ForWAM4GBBSeries.jpg?v=1617875337&width=4096)
Excellent item, just what I needed for a retro look to clip on an Alice harness. I haven't seen these anywhere else. Nice and heavy. Very shiny new, but after a rub with sandpaper it looks great. Will look to buying another with my next order.
Great repro 100mph tape. Put it on everything - handguards, magazines, radio, helmet straps etc for that retro look. Actual colour is darker than shown in my photo.
I ordered a set of these and got Cyma ones. Ordered another couple and got Cyma ones again. Great mags, work well, feed well, full metal.
It's all perfect, I ran 4 mags of 5.56 55gr. And 62grn back to back and everything was still in place and working perfectly, I'm definitely returning to purchase more, thank you very much Sixmm
The bottom of the GM magazine has a button which will block the base pad after you install it. It you need to take the base pad out, it will need a lot of works to do.