![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_2.jpg?v=1635498912&width=1200)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_3.jpg?v=1635498913&width=1200)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_1.jpg?v=1635498913&width=1200)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_2.jpg?v=1635498912&width=450)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_3.jpg?v=1635498913&width=450)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_1.jpg?v=1635498913&width=450)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_2.jpg?v=1635498912&width=4096)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_3.jpg?v=1635498913&width=4096)
![[5KU] Steel hammer with 5 bearings[For WA M4 GBB Series]](http://www.sixmm.com/cdn/shop/products/5KU_Steelhammerwith5bearings_ForWAM4GBBSeries_1.jpg?v=1635498913&width=4096)
Mounts without problems, and gives a S.F. look ;)
The piece takes place of the old one perfectly, The relief is especially noticeable during the blowback
Send complet false model, not like in the photo :( an became only 50% cash back
Got two of these from Sixmm. One went into a ASG M15 URX-SBR, the other into Specna Flex M4. Simple fit with no modifications required. Easy reroute of power cable to rear (channel part of gearbox) into PDW stock, Specna required a little extension to get to end of buffer tube. 1.14J on 90 PSI on 6.02 x 230mm barrel. 16 rps. Excellent, affordable, super quiet and responsive trigger.