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version 2 CNC machine steel bolt carrier with new bolt lock system
- Buffer extension thread of the lower receiver is stronger and less broken
- Aluminum CNC
Long Outer Barrel with Metal Construction
Hephaestus Enhanced Buffer Kit for Umarex ( KSC / KWA ) HK417 GBB Rifle Series Buttstock version 2 CNC machine steelCNC machined aluminum casing with spring loaded stainless steel weight insert. Increase kick and produce sharp recoil. Reduce bolt carrier bounce for enhanced performance and shooting experience. Suitable for Umarex HK417 GBB series by KSC KWA. Reinforced replacement for original Buffer assembly.
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